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Health problems and help-seeking in a nationwide sample of operational Norwegian ambulance personnel
© Sterud et al; licensee BioMed Central Ltd. 2008
Received: 01 June 2007
Accepted: 04 January 2008
Published: 04 January 2008
To estimate the prevalence of anxiety and depression symptoms, and their association with professional help-seeking, among operational ambulance personnel and a general working population, and to study the symptoms of musculoskeletal pain and disturbed sleep among ambulance personnel.
The results of a comprehensive nationwide questionnaire survey of operational ambulance personnel (n = 1180) were compared with the findings of a population-based Norwegian health study of working people (n = 31,987). The questionnaire included measures of help-seeking, the Hospital Anxiety and Depression Scale, the Subjective Health Complaints Questionnaire, the Karolinska Sleep Questionnaire and the Need for Recovery after Work Scale.
Compared with those in the reference population, the mean of level anxiety symptoms in the ambulance sample was lower for men (3.5 vs. 3.9, P <0.001) and women (4.0 vs. 4.4, P <0.05), and the mean level of depression symptoms in ambulance workers was lower for men (2.3 vs. 2.8, P <0.05) but not for women (2.9 vs. 3.1, P = 0.22). A model adjusted for anxiety and depression symptoms indicated that ambulance personnel had lower levels of help-seeking except for seeing a chiropractor (12% vs. 5%, P <0.01). In the ambulance sample, symptoms of musculoskeletal pain were most consistently associated with help-seeking. In the adjusted model, only symptoms of disturbed sleep were associated with help-seeking from a psychologist/psychiatrist (total sample = 2.3%). Help-seeking was more often reported by women but was largely unaffected by age.
The assumption that ambulance personnel have more anxiety and depression symptoms than the general working population was not supported. The level of musculoskeletal pain and, accordingly, the level of help-seeking from a chiropractor were higher for ambulance workers. More research should address the physical strains among ambulance personnel.
Some previous studies have reported a high prevalence of mental [1, 2] and physical  health problems among ambulance workers. However, it is unclear whether ambulance personnel have more mental health problems than the general working population. Furthermore, the relationship between health problems and help-seeking among ambulance personnel has not been studied .
The help-seeking literature has reported that whether people seek help is associated with needs, socio-demographic factors and attitudes . Among health care workers there may be a general reluctance towards seeking professional help, especially for mental health problems, as has been reported for Norwegian physicians . Several reasons may account for the supposed resistance. Health care workers, including ambulance personnel, are trained to provide medical care under life-and-death circumstances and to control their emotions and deal with other people's problems while on the job. Therefore, it may be difficult for ambulance personnel to admit to having personal problems and so, rather than seeking help, they may try to solve their problems alone. Further, the male-dominated nature of the ambulance occupation may promote a culture that discourages people from admitting that they are having mental problems, which could lead to under-recognition and a low propensity to seek help . In a study of police, another male-dominated occupation, employees reported and sought professional help for somatic complaints more often than did the general population, but their threshold for contacting a psychologist or a psychiatrist was reported to be high . A similar help-seeking profile may be expected for ambulance personnel.
The type of symptoms experienced influences the decision to seek professional help or not. People are more likely to seek help for somatic complaints, whereas most persons with mental disorders do not get professional help . Moreover, somatic symptoms such as fatigue, musculoskeletal pain and sleep problems are common in both anxiety and depression [10, 11], and people with both affective disorders and painful physical symptoms have a significantly lower rate of help-seeking for emotional reasons .
The co-morbidity of mental health problems and somatic complaints has not been studied in the ambulance services. In general, few studies have investigated the physical health of ambulance workers, but it has been suggested that they have more self-reported musculoskeletal  and physical health  problems than the general population. Further, there has been a lack of alternative health measures to identify smaller, everyday problems in ambulance workers, such as disturbed sleep and the need for recovery after work . One obvious source of disturbed sleep is the effect of work life, such as shift work, which is an integral part of ambulance work .
Ambulance personnel have more anxiety and depression symptoms than the general working population, and they are less likely to seek help than the general population, and this may be influenced by the level of depression and anxiety symptoms.
Ambulance personnel report a relatively high level of somatic complaints. The prevalence of symptoms of musculoskeletal pain, disturbed sleep and need for recovery is higher among operational ambulance personnel with anxiety and depression symptoms.
Ambulance personnel (like police) are more likely to seek help for somatic complaints and are less likely to seek help for mental problems. There is a relationship between different types of health problems and the type of professional help that is sought.
Ambulance services in Norway are organized into 19 main ambulance regions that are responsible for ensuring adequate ambulance services for all communities. Some hospitals have their own integrated ambulance departments, whereas, in several counties, ambulance services are organized independently of the hospital. In several rural locations, ambulance services cover small populations. Here, they consist of one or two ambulances that are usually privately administered. However, private providers have established larger service units in some counties.
Participants in this study included officers, middle managers and managers who reported ambulance work to be more than 50% of their workload. The term "operational ambulance personnel" is used to describe these respondents.
Ambulance personnel received no formalized education until 1997. Thereafter, ambulance education consisted of a four-year education course at high-school level (including a two-year apprenticeship). Those who have achieved this qualification can apply for two-year part-time paramedic education at college level. Hence, the educational background of the ambulance personnel in Norway ranges from those with no formal education through to workers with formal ambulance education at high school or college level. Some of the ambulance personnel are also nurses or auxiliary nurses. Educational level was not related to any of the outcome variables and was therefore not applied as an independent variable. In April 2005, questionnaires were distributed to the chiefs of ambulance services in all 19 ambulance regions in Norway. All chiefs agreed to distribute the questionnaire to all ambulance personnel in the ambulance stations within their regions. This procedure was chosen because no central national register covering all employed ambulance personnel in Norway was available. Respondents were given an identification number in order to enable a follow-up one year later. Two follow-up reminders were distributed through the ambulance chiefs, and the two major worker union organizations encouraged their members to answer the questionnaire in their homepages and their membership journals. Respondents gave their consent to participate in the study by returning the questionnaire. The Regional Committee for Medical Research Ethics, Southern Norway, reviewed and advised the project.
In total, 3200 questionnaires were distributed. Based on reports from four of the ambulance chiefs, 64 ambulance personnel were excluded because they were no longer in service. In total, 1286 persons returned questionnaires (41%). Unfortunately, we were not able to get fully updated address lists from the other ambulance chiefs. Thus, the real response rate was probably higher than 41%. Responses were obtained from all ambulance regions. The response rates in the different regions ranged from 31% to 59%, median 41.5%, with the exception of one region with the low response rate of 10%. Overall, 53.4% of the respondents reported to work in rural settings (defined as serving a population with fewer than 20,000 inhabitants), and 46.6% reported to work in an urban setting (defined as serving a population with more than 20,000 inhabitants. Overall, the data show that we have rather good representation of ambulance personnel on a national.
Analysis of variance (ANOVA) was used to compare mean levels of the included health variables, and logistic regression was used to compare the level of help-seeking, and to test the assumption that the bivariate associations were similar in those who responded in the main round and those who responded after one or two reminders. There were no significant differences in descriptive scores, and no significant interactions between the bivariate associations and time of response.
Of the respondents, 1180 were operational ambulance workers (> 50% of their working time). Of these, 76.8% were men and 23.2% women. Age ranged from 18 to 66 years and the mean age was 36.8 (SD 9.3) years. The mean age for men was 37.6 (9.0) years, which was significantly higher than the mean age for women of 33.8 (9.6) (p <0.001).
Each member of the population of Nord-Trøndelag County of Norway, aged 20 or older, was sent an initial questionnaire and an invitation to participate in HUNT 2 in 1995–97. In total, 92,100 people aged between 20 and 89 years were invited to participate in this study (initial questionnaire, including the HADS items). Of these, 65,648 (71%) attended a physical examination, where they received a second set of questionnaires (including the help-seeking items), of which 52,814 were completed. The general characteristics of the participants were fairly representative of the Norwegian population. Details on the data collection procedure and the characteristics of the study population have been published elsewhere . In the present study, only those who were full-time employees and between 20 and 60 years old were included (N = 31,987). Of these 47% were men and 53% were women. Age ranged from to 20 to 60, with a mean age of 41.1 (SD = 10.3). The mean age was not significantly different for men and women. The questions on anxiety and depression were asked in the initial questionnaire (N = 31,618), and the questions regarding help-seeking were asked in the second set of questionnaires (N = 25,919).
Help-seeking was measured by one question: "Have you, during the last 12 months, contacted any of the following health professionals?" The response was "yes" or "no" on each of 10 alternatives: general practitioner, occupational health practitioner, physiotherapist, chiropractor, specialist in private practice, hospital physician with or without admission, other physician, psychologist/psychiatrist and homoeopathist. Four items (specialist in private practice, hospital physician with or without admission and other physician) were combined into the category "other physician." "Physiotherapist" and "chiropractor" were treated separately in the comparative analyses and combined in the ambulance specific analyses. The item "psychologist/psychiatrist" was only available in the ambulance sample. The item "homoeopathist" was omitted from the analyses because of the low number of respondents. The responses were not mutually exclusive.
Anxiety and depression symptoms were measured using The Hospital Anxiety and Depression scale (HADS)  and divided into a depression subscale (seven items) and an anxiety subscale (seven items). Each item is scored from 0 to 3. Forms with at least five of the seven items filled in on either subscale were included, and the score was computed as the mean of valid responses multiplied by seven. Principal component analysis supported a two-factor solution, anxiety (α = 0.8) and depression (α = 0.7), in both samples. Optimal balance between sensitivity and specificity for HADS as a screening instrument has been most frequently reported at a cut-off score of 8 or more , and this was chosen in the present study.
Data on sleep disturbance were obtained using four items from the Karolinska Sleep Questionnaire . These items has been used as indicators of "disturbed sleep" in other studies [19, 20]. Principal component analysis supported a one-factor solution: disturbed sleep ("difficulties falling asleep", "repeated awakenings", "premature awakening" and "disturbed/restless sleep") (α = 0.8). The items are scored on a five-point rating scale ranging from never (0) to always/everyday (4). The score was computed as the mean of valid responses, and the criterion for "disturbed sleep" symptoms was set at 3.5 .
The subjective experience of health was assessed by a 10-item version of the Subjective Health Complaint (SHC) questionnaire . The items are scored on a four-point rating scale ranging from no complaints (0) to serious complaints (3). Each complaint is also scored for duration (number of days) during the last 30 days, but this information was not considered in the present analysis. "Somatic complaints cases" was defined as a score ≥ 2 on at least one of the 10 items yielding a prevalence of 43.6% . This cut-off was chosen in order to allow comparisons with other samples (e.g., Norwegian police and physicians). Cases at single item level was (men/women): Shoulder (13.7%/18.2%), upper back (9.4%/10.9%), low back (22.1%/22.1%), neck (14.7%/20.7%), arm (7.0%/8.3%), leg pain during physical activity (4.6%/4.5%) and headache/migraine (10.5%/14.2%), chest (0.8%/0.8%), digestive problems (6.8%/7.1%) and vertigo (1.7%/1.1%). Consistent with previous studies , seven of the items (shoulder, upper back, low back, neck, arm, leg pain during physical activity and headache/migraine) resolved to a single factor defined as "musculoskeletal pain" (α = 0.7). The score was computed as the mean of valid responses, and used as a continuous variable in the regression analyses.
The Need for Recovery after Work Scale comprises 11 dichotomous items . Typical items of this scale are: "At the end of a working day I am really feeling worn-out" and "I find it hard to relax at the end of a working day". The score was calculated by adding the individual's scores on the 11 items. Higher scores indicate a higher degree of need for recovery after work. This measure has been found reliable and valid, and it contains items that ask for the effect of the working day .
Gender was coded with men as a reference category. Age was used as a continuous variable with a one-unit change representing 10 years.
Means and frequencies were used to describe the data in the present study, and t tests and χ2 tests were used to test for differences across samples. Principal component analysis with varimax rotation was used to check the factor structure of the instruments. Unianova analyses were used to compare mean scores across samples, adjusted for age. Logistic regression analyses were used to estimate the prevalence of depression and anxiety symptoms, adjusted for age and gender (separate analyses), and their relationship to help-seeking in the two samples. Further, simultaneous effects in the ambulance sample were estimated by logistic regression. The assumption of linearity in the logit held approximately for all independent health variables. These variables, together with age, were treated as continuous variables and standardized in the present analyses.
Description of the dependent and independent variables, and age adjusted estimates on anxiety and depression symptoms in the two samples
A. Categorical variables
General working population sample
Anxiety symptoms Cut ≥ 8
(age adjusted estimates)
Depression symptoms Cut ≥ 8
(age adjusted estimates)
B. Continuous variables
Anxiety symptoms (0–21)
(age adjusted estimates)
Depression symptoms (0–21)
(age adjusted estimates)
C. Ambulance sample (only)
Musculoskeletal pain (0–3)
Need for Recovery
Help-seeking during last 12 months among ambulance personnel compared to a general working population
Occupational health practitioner
OR (95% CI)
OR (95% CI)
OR (95% CI)
OR (95% CI)
0.7 (0.6–0.8) ***
0.9 (0.8–1.1) ns
0.7 (0.6–0.9) *
2.5 (2.0–3.2) ***
2.4 (2.3–2.5) ***
1.4 (1.3–1.5) ***
1.5 (1.4–1.6) ***
0.8 (0.7–0.9) ***
0.4 (0.4–0.5) ***
1.0 (0.9–1.0) ns
1.1 (1.1–1.2) ***
1.3 (1.2–1.3) ***
1.3 (1.3–1.4) ***
1.3 (1.3–1.4) ***
1.7 (1.6–1.9) ***
1.4 (1.3–1.6) ***
1.4 (1.3–1.6) ***
1.2 (1.0–1.5) ***
1.1 (1.1–1.3) ***
1.4 (1.3–1.6) ***
1.4 (1.2–1.5) ***
1.3 (1.2–1.5) ***
1.2 (0.9–1.5) ns
1.0 (0.9–1.2) ns
Symptoms of disturbed sleep, musculoskeletal pain and need for recovery among operational ambulance personnel with anxiety and depression symptoms
Need for recovery
all (n = 1161)
men (n = 889)
women (n = 272)
HADS Anxiety ≥ 8
all (n = 126)
69.4 (60.9–77.1) χ2***
21.4 (14.3–28.8) χ2***
5.4 (4.9–5.8) t-test
men (n = 89)
69.7 (60.5–79.5) ***
23.6 (14.8–32.4) ***
5.9 (5.3–6.4) ***
women (n = 37)
68.6 (54.1–83.9) **
16.2 (4.3–28.1) *
4.3 (3.4–5.2) ***
HADS Depression ≥ 8
all (n = 85)
75.7 (66.9–85.1) ***
31.1 (20.5–41.6) ***
6.2 (5.6–6.8) ***
men (n = 65)
76.6 (66.8–87.2) ***
28.1 (17.1–39.2) ***
6.3 (5.6–7.0) ***
women (n = 10)
70.0 (41.6–98.4) ns
50 (19.0–80.1) ***
5.4 (3.6–7.1) **
Help-seeking during last 12 months among Norwegian ambulance personnel
Occupational health practitioner
1.4 (1.3–1.6) ***
1.3 (1.2–1.5) ***
1.1 (0.9–1.3) ns
1.8 (1.3–2.4) ***
1.3 (1.1–1.4) ***
1.2 (1.1–1.4) **
1.1 (0.9–1.2) ns
1.7 (1.3–2.3) ***
1.7 (1.5–1.9) ***
1.5 (1.4 1.8) ***
1.9 (1.6–2.2) ***
1.7 (1.3–2.4) ***
1.6 (1.4–1.8) ***
1.3 (1.2–1.5) ***
1.2 (1.0–1.4) **
2.2 (1.5–3.3) ***
Need for recovery+
1.4 (1.3–1.6) ***
1.4 (1.2–1.5) ***
1.3 (1.1–1.5) ***
1.6 (1.2–2.3) ***
0.6 (0.5–0.8) **
0.6 (0.5–0.9) **
0.6 (0.4–0.8) **
0.5 (0.2–1.2) ns
1.1 (1.0–1.3) ns
1.2 (1.0–1.4) ***
1.2 (0.8–1.8) ns
1.6 (1.1–2.3) *
1.6 (1.0–2.5) *
0.8 (0.7–1.0) *
1.5 (1.3–1.7) ***
1.4 (1.2–1.6) ***
1.9 (1.6–2.3) ***
1.2 (1.0–1.4) *
1.9 (1.1–3.2) *
Need for recovery+
1.2 (1.9–1.5) *
0.7 (0.5–1.0) *
0.7 (0.5–0.9) *
0.6 (0.4–1.0) *
1.8 (1.2–2.7) **
-2 log likelihood
The mean level of anxiety and depression symptoms was lower among ambulance personnel than in the general working population. This is an unexpected finding because the comparison group consists of the general working population and the healthy worker effect is therefore probably diminished. Being female in a male-dominated working environment such as the ambulance services does not seem to be a risk factor for mental health problems among ambulance women. In general, there were small and non-significant differences between men and women in the ambulance sample, and the relative gender differences were similar to those reported in the general working population. The prevalence rates of anxiety and depression cases (11% and 7.2%, respectively) among operational ambulance personnel were similar to those reported for Norwegian police (11.8% and 8.2%, respectively)  but were substantially lower than the high prevalence rates (> 20%) that have been reported in some studies of ambulance personnel [1, 2, 26, 27]. However, none of the previous ambulance studies was nationwide, and other studies have reported lower prevalence rates (2.1%)  and a lower mean level of anxiety and depression in ambulance workers compared with a normative sample of working males in the USA .
The present data support the hypothesis that ambulance personnel in general are less likely to seek help than the general working population. These differences were significant when adjusted for age, gender and level of depression and anxiety symptoms. It is noteworthy that as little as 3% of ambulance workers had visited an occupational health practitioner, compared with 24% of the general working population. Higher age was significantly related to visiting an occupational health practitioner, which might reflect a higher level of mistrust and concern about anonymity among younger workers or a lack of information about these services to new employees. Overall, these findings partly support the assumption that health care workers may be more reluctant to seek professional help, but they do not support the hypothesis that they are especially reluctant to seek professional help for mental health problems.
The level of somatic complaints cases was relatively high (43.6%), which is similar to that reported for a nationwide sample of Norwegian police (40.7%)  and considerably higher than that reported for Norwegian physicians (29.5%) . However, the chosen cut-off value for "cases" is low and has not been validated, hence the results should be interpreted with caution. Prevalence rates at item level were available from the general population in Norway . Ambulance men report a higher prevalence of pain in neck (14.7% vs. 11.2%), upper back (9.4% vs. 6.0%), and lower back (22.1% vs. 14.0%) compared to that of the males in the general population. Ambulance women, on the other hand, report a lower prevalence on all musculoskeletal pain items compared to that of women in the general population, but relative high level of pain in neck (20.7% vs. 14.7) and shoulder (18.2% vs. 13.7) compared to that of ambulance men. The general population sample included people who were not employed and in a wider age range (aged 15–84 year) than in the present, and the comparison should be interpreted with caution. However, given that that a general population sample most likely is less healthy than a sample drawn from an expectedly health working population, the level of musculoskeletal pain symptoms, particularly among male ambulance personnel, may be considered relatively high. The prevalence of disturbed sleep symptoms (6.3%) was similar to that reported in a study encompassing 40 companies in central Sweden . Unfortunately, no Norwegian reference data were available. These prevalence rates are low compared with the 30% reported in a study of ambulance personnel in Sweden. However, the Swedish study only included one item on sleep, and cases were defined as respondents reporting "sleeping problems sometimes or often ."
Musculoskeletal pain was most consistently related to more help-seeking from all health professions, except for occupational health practitioners. Furthermore, ambulance personnel visited a chiropractor more often than did the reference population (11.7 vs. 4.5). Although it is generally known that depressive symptoms might be hidden and shown as somatic complaints , neither depression nor anxiety were bivariately associated with ambulance workers visiting a chiropractor/physiotherapist. In contrast, 2.3% had visited a psychologist/psychiatrist. In the adjusted model, only symptoms of disturbed sleep were significantly associated with visiting a psychologist/psychiatrist. Given the relatively low level of anxiety and depression symptoms, this might indicate adequate help-seeking, although reluctance towards seeking help from a psychologist/psychiatrist cannot be ruled out.
In the exploration of the relationship between different types of health problems, neither symptoms of anxiety nor depression was significantly associated with more help-seeking in the adjusted model. This could be seen as a consequence of the higher proportion of symptoms of musculoskeletal pain, disturbed sleep and need for recovery among those with anxiety and depression symptoms, which is consistent with what has been reported in the general literature [33, 34]. The prevalence of somatic complaints was more than 1.6 times greater (69.4/43.6%), the prevalence of disturbed sleep more than 3.4 times greater (21.4/6.3%) and the mean level of need for recovery 2.2 times greater (5.4/2.5) among anxiety and depression cases compared with the total sample. The distinction between these conditions can be a challenge not only in epidemiological surveys but also in clinical practice. We did not find, however, any support for the assumption that the association between anxiety or depression symptoms and help-seeking might depend on the co-occurrence of other health symptoms. Furthermore, males reported significantly lower levels of help-seeking from general practitioners, hospital physicians and physiotherapists, which is consistent with reports from studies of the general population  and Norwegian police . Higher age was bivariately related to help-seeking from a physiotherapist/chiropractor. In the adjusted model, this relationship was no longer significant and was mainly explained by the higher level of musculoskeletal pain among the older workers, which is in accordance with what has been found in other studies . Otherwise, help-seeking was largely unaffected by age.
Strengths and limitations
The major strength of this study is that it is the first large-scale nationwide study of operative ambulance. Furthermore, data on depression and anxiety symptoms, as well as help-seeking, were compared with a general working population in Norway. Some limitations of this study should be considered. The cross-sectional design prevents us from providing direct evidence of the direction of the reported relationships. Report bias may be a problem as, for example, anxiety and depressive symptoms are socially undesirable topics, particularly in a masculine milieu. Further, the response rate was relatively low, which may compromise the representativeness of the data, and raises the possibility that differences between the two groups are due to selection biases, particularly if the non-responders in ambulance workers had more anxiety and depression symptoms. However, there were no significant differences in descriptive scores, and no significant interactions between the bivariate associations and time of response. As late responders may resemble the non-responders [36, 37], the lack of representativeness may not be a severe problem. Further, because of the problems in the questionnaire distribution, it is likely that the real response rate is substantially higher than the estimated proportion.
Contrary to common beliefs, ambulance personnel reported significantly less anxiety and depression symptoms than did the general working population in Norway. Help-seeking was less frequent among ambulance personnel and this effect was independent of the level of anxiety and depression symptoms. The level of musculoskeletal pain and, accordingly, the level of help-seeking from a chiropractor were relatively high. More research should address the physical strains among ambulance personnel. Operational ambulance personnel might be reluctant to contact a psychologist/psychiatrist or an occupational health practitioner. The ambulance services may benefit from providing their employees with better information about their occupational health practitioner systems.
The study was funded by The Eastern Norway Regional Health Authority, and The Laerdal Foundation for Acute Medicine. The authors would like to thank the HUNT Research Centre for permission to use the data from HUNT-2, and Arne Henriksen and Stein T. Moen (SOSCON) for practical assistance.
- Bennett P, Williams Y, Page N, Hood K, Woollard M: Levels of mental health problems among UK emergency ambulance workers. Emerg Med J. 2004, 21: 235-236. 10.1136/emj.2003.005645.View ArticlePubMedPubMed CentralGoogle Scholar
- Alexander DA, Klein S: Ambulance personnel and critical incidents: impact of accident and emergency work on mental health and emotional well-being. Br J Psychiatry. 2001, 178: 76-81. 10.1192/bjp.178.1.76.View ArticlePubMedGoogle Scholar
- Johnson S, Cooper C, Cartwright S, Donald I, Taylor P, Millet C: The experience of work-related stress across occupations. J Manage Psych. 2005, 20: 178-187.View ArticleGoogle Scholar
- Sterud T, Ekeberg O, Hem E: Health status in the ambulance services: A systematic review. BMC Health Serv Res. 2006, 6: 82-10.1186/1472-6963-6-82.View ArticlePubMedPubMed CentralGoogle Scholar
- Mojtabai R, Olfson M, Mechanic D: Perceived need and help-seeking in adults with mood, anxiety, or substance use disorders. Arch Gen Psychiatry. 2002, 59: 77-84. 10.1001/archpsyc.59.1.77.View ArticlePubMedGoogle Scholar
- Tyssen R, Rovik JO, Vaglum P, Gronvold NT, Ekeberg O: Help-seeking for mental health problems among young physicians: is it the most ill that seeks help? - A longitudinal and nationwide study. Soc Psychiatry Psychiatr Epidemiol. 2004, 39: 989-993. 10.1007/s00127-004-0831-8.View ArticlePubMedGoogle Scholar
- Galdas PM, Cheater F, Marshall P: Men and health help-seeking behaviour: literature review. J Adv Nurs. 2005, 49: 616-623. 10.1111/j.1365-2648.2004.03331.x.View ArticlePubMedGoogle Scholar
- Berg AM, Hem E, Lau B, Ekeberg O: Help-seeking in the Norwegian Police Service. J Occup Health. 2006, 48: 145-153. 10.1539/joh.48.145.View ArticlePubMedGoogle Scholar
- Kessler RC, McGonagle KA, Zhao S, Nelson CB, Hughes M, Eshleman S, Wittchen HU, Kendler KS: Lifetime and 12-month prevalence of DSM-III-R psychiatric disorders in the United States. Results from the National Comorbidity Survey. Arch Gen Psychiatry. 1994, 51: 8-19.View ArticlePubMedGoogle Scholar
- Ohayon MM: Specific characteristics of the pain/depression association in the general population. J Clin Psychiatry. 2004, 65 Suppl 12: 5-9.PubMedGoogle Scholar
- Ohayon MM, Roth T: What are the contributing factors for insomnia in the general population?. J Psychosom Res. 2001, 51: 745-755. 10.1016/S0022-3999(01)00285-9.View ArticlePubMedGoogle Scholar
- Demyttenaere K, Bonnewyn A, Bruffaerts R, Brugha T, De Graaf R, Alonso J: Comorbid painful physical symptoms and depression: prevalence, work loss, and help seeking. J Affect Disord. 2006, 92: 185-193. 10.1016/j.jad.2006.01.007.View ArticlePubMedGoogle Scholar
- Okada N, Ishii N, Nakata M, Nakayama S: Occupational stress among Japanese emergency medical technicians: Hyogo Prefecture. Prehospital Disaster Med. 2005, 20: 115-121.View ArticlePubMedGoogle Scholar
- Akerstedt T: Shift work and disturbed sleep/wakefulness. Occup Med. 2003, 53: 89-94. 10.1093/occmed/kqg046.View ArticleGoogle Scholar
- Holmen J, Midthjell K, Krüger , Langhammer A, Holmen TL, Bratberg GH, Vatten L, Lund-Larsen PG: The Nord-Trøndelag Health Study 1995-97 (HUNT 2): Objectives, contents, methods and participation. Norwegian Journal of Epidemiology. 2007, 13: 19-32.Google Scholar
- Zigmond AS, Snaith RP: The hospital anxiety and depression scale. Acta Psychiatr Scand. 1983, 67: 361-370. 10.1111/j.1600-0447.1983.tb09716.x.View ArticlePubMedGoogle Scholar
- Bjelland I, Dahl AA, Haug TT, Neckelmann D: The validity of the Hospital Anxiety and Depression Scale. An updated literature review. J Psychosom Res. 2002, 52: 69-77. 10.1016/S0022-3999(01)00296-3.View ArticlePubMedGoogle Scholar
- Akerstedt T, Knutsson A, Westerholm P, Theorell T, Alfredsson L, Kecklund G: Sleep disturbances, work stress and work hours: a cross-sectional study. J Psychosom Res. 2002, 53: 741-748. 10.1016/S0022-3999(02)00333-1.View ArticlePubMedGoogle Scholar
- Fahlen G, Knutsson A, Peter R, Akerstedt T, Nordin M, Alfredsson L, Westerholm P: Effort-reward imbalance, sleep disturbances and fatigue. Int Arch Occup Environ Health. 2006, 79: 371-378. 10.1007/s00420-005-0063-6.View ArticlePubMedGoogle Scholar
- Akerstedt T, Knutsson A, Westerholm P, Theorell T, Alfredsson L, Kecklund G: Mental fatigue, work and sleep. J Psychosom Res. 2004, 57: 427-433. 10.1016/j.jpsychores.2003.12.001.View ArticlePubMedGoogle Scholar
- Ursin H, Endresen IM, Ursin G: Psychological factors and self-reports of muscle pain. Eur J Appl Physiol Occup Physiol. 1988, 57 (3): 282-290. 10.1007/BF00635986.View ArticlePubMedGoogle Scholar
- Aasland OG, Olff M, Falkum E, Schweder T, Ursin H: Health complaints and job stress in Norwegian physicians: the use of an overlapping questionnaire design. Soc Sci Med. 1997, 45: 1615-1629. 10.1016/S0277-9536(97)00093-2.View ArticlePubMedGoogle Scholar
- Eriksen HR, Ihlebaek C, Ursin H: A scoring system for subjective health complaints (SHC). Scand J Public Health. 1999, 27: 63-72. 10.1080/14034949950153931. [http://]View ArticlePubMedGoogle Scholar
- Sluiter JK, de Croon EM, Meijman TF, Frings-Dresen MH: Need for recovery from work related fatigue and its role in the development and prediction of subjective health complaints. Occup Environ Med. 2003, 60 Suppl 1: i62-i70. 10.1136/oem.60.suppl_1.i62.View ArticlePubMedGoogle Scholar
- de Croon EM, Sluiter JK, Frings-Dresen MH: Psychometric properties of the Need for Recovery after work scale: test-retest reliability and sensitivity to detect change. Occup Environ Med. 2006, 63: 202-206. 10.1136/oem.2004.018275.View ArticlePubMedPubMed CentralGoogle Scholar
- Clohessy S, Ehlers A: PTSD symptoms, response to intrusive memories and coping in ambulance service workers. Br J Clin Psychol. 1999, 38: 251-265. 10.1348/014466599162836.View ArticlePubMedGoogle Scholar
- Thompson J: Psychological impact of body recovery duties. J R Soc Med. 1993, 86: 628-629.PubMedPubMed CentralGoogle Scholar
- Regehr C, Goldberg G, Hughes J: Exposure to human tragedy, empathy, and trauma in ambulance paramedics. Am J Orthopsychiatry. 2002, 72: 505-513. 10.1037/0002-94220.127.116.115.View ArticlePubMedGoogle Scholar
- Mock EF, Wrenn KD, Wright SW, Eustis TC, Slovis CM: Anxiety levels in EMS providers: effects of violence and shifts schedules. Am J Emerg Med. 1999, 17: 509-511. 10.1016/S0735-6757(99)90186-9.View ArticlePubMedGoogle Scholar
- Ihlebaek C, Eriksen HR, Ursin H: Prevalence of subjective health complaints (SHC) in Norway. Scand J Public Health. 2002, 30: 20-29.View ArticlePubMedGoogle Scholar
- Aasa U, Brulin C, Angquist KA, Barnekow-Bergkvist M: Work-related psychosocial factors, worry about work conditions and health complaints among female and male ambulance personnel. Scand J Caring Sci. 2005, 19: 251-258. 10.1111/j.1471-6712.2005.00333.x.View ArticlePubMedGoogle Scholar
- Haug TT, Mykletun A, Dahl AA: The association between anxiety, depression, and somatic symptoms in a large population: the HUNT-II study. Psychosom Med. 2004, 66: 845-851. 10.1097/01.psy.0000145823.85658.0c.View ArticlePubMedGoogle Scholar
- Simon GE, VonKorff M, Piccinelli M, Fullerton C, Ormel J: An international study of the relation between somatic symptoms and depression. N Engl J Med. 1999, 341: 1329-1335. 10.1056/NEJM199910283411801.View ArticlePubMedGoogle Scholar
- Oliver MI, Pearson N, Coe N, Gunnell D: Help-seeking behaviour in men and women with common mental health problems: cross-sectional study. Br J Psychiatry. 2005, 186: 297-301. 10.1192/bjp.186.4.297.View ArticlePubMedGoogle Scholar
- Addis ME, Mahalik JR: Men, masculinity, and the contexts of help seeking. Am Psychol. 2003, 58: 5-14. 10.1037/0003-066X.58.1.5.View ArticlePubMedGoogle Scholar
- Bakke P: Postal survey on airborne occupational exposure and respiratory disorders in Norway: causes and consequences of non-response. J Epidemiol Community Health. 1990, 44: 316-320.View ArticlePubMedPubMed CentralGoogle Scholar
- Tennant A: A confidence interval approach to investigating non-response bias and monitoring response to postal questionnaires. J Epidemiol Community Health. 1991, 45: 81-85.View ArticlePubMedPubMed CentralGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2458/8/3/prepub
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