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The impact of a brief lifestyle intervention delivered by generalist community nurses (CN SNAP trial)
© Harris et al.; licensee BioMed Central Ltd. 2013
Received: 12 September 2012
Accepted: 16 April 2013
Published: 22 April 2013
The risk factors for chronic disease, smoking, poor nutrition, hazardous alcohol consumption, physical inactivity and weight (SNAPW) are common in primary health care (PHC) affording opportunity for preventive interventions. Community nurses are an important component of PHC in Australia. However there has been little research evaluating the effectiveness of lifestyle interventions in routine community nursing practice. This study aimed to address this gap in our knowledge.
The study was a quasi-experimental trial involving four generalist community nursing (CN) services in New South Wales, Australia. Two services were randomly allocated to an ‘early intervention’ and two to a ‘late intervention’ group. Nurses in the early intervention group received training and support in identifying risk factors and offering brief lifestyle intervention for clients. Those in the late intervention group provided usual care for the first 6 months and then received training. Clients aged 30–80 years who were referred to the services between September 2009 and September 2010 were recruited prior to being seen by the nurse and baseline self-reported data collected. Data on their SNAPW risk factors, readiness to change these behaviours and advice and referral received about their risk factors in the previous 3 months were collected at baseline, 3 and 6 months. Analysis compared changes using univariate and multilevel regression techniques.
804 participants were recruited from 2361 (34.1%) eligible clients. The proportion of clients who recalled receiving dietary or physical activity advice increased between baseline and 3 months in the early intervention group (from 12.9 to 23.3% and 12.3 to 19.1% respectively) as did the proportion who recalled being referred for dietary or physical activity interventions (from 9.5 to 15.6% and 5.8 to 21.0% respectively). There was no change in the late intervention group. There a shift towards greater readiness to change in those who were physically inactive in the early but not the comparison group. Clients in both groups reported being more physically active and eating more fruit and vegetables but there were no significant differences between groups at 6 months.
The study demonstrated that although the intervention was associated with increases in advice and referral for diet or physical activity and readiness for change in physical activity, this did not translate into significant changes in lifestyle behaviours or weight. This suggests a need to facilitate referral to more intensive long-term interventions for clients with risk factors identified by primary health care nurses.
In Australia, chronic diseases such as heart disease and diabetes are the leading causes of death and disability . The risk factors for these conditions include risk behaviours (in smoking, nutrition, alcohol and physical activity) and overweight (SNAPW). These are prevalent in the community, with over 90% of adults not consuming the recommended five serves of vegetables per day, over half not consuming adequate amounts of fruit, 62% overweight or obese, one third, physically inactive, one in five smoke and 21% drink alcohol at levels which pose a risk to their health .
Primary health care (PHC) is an important setting for addressing lifestyle risk factors because of its accessibility, continuity, and comprehensiveness of the care provided . There is evidence that clients expect to receive lifestyle intervention from PHC clinicians . Lifestyle interventions delivered in PHC are effective in helping clients to stop smoking , reduce ‘at-risk alcohol’ consumption , improve weight, diet and physical activity levels [7–12]. The 5As (assess, advise (including motivational interviewing) and agree on goals, assist (including referral), and arrange (follow up) have been developed as a framework for addressing these risk factors in clinical practice [13, 14].
In NSW, generalist community nurses frequently see clients in their own home, providing care for patients recently discharged from hospital, the aged and those with chronic diseases. Although the traditional community nursing model of practice includes health promotion activities, community nursing services have increasingly tended to provide shorter term more clinically focused services to individual clients [15, 16]. Our previous research has shown that community health nurses consider the provision of lifestyle intervention appropriate to their role and it is well accepted by clients . However, few studies have evaluated the effectiveness of lifestyle interventions provided by community nurses in routine practice [18–21]. The aim of this study was to evaluate the impact of a brief lifestyle intervention delivered by community health nurses as part of their routine practice on changes in clients’ SNAPW risk factors.
Study design and setting
This study was conducted in four general community nursing services in New South Wales, Australia. Services were recruited via an expression of interest mailed to all Area Health Services (AHS) in NSW (n = 8). The design was quasi-experimental, with the services randomly allocated to an ‘early intervention’ (EI) group or ‘late intervention’ (LI) (comparison) group. EI services were provided with training and support for nurses in identifying clients with high risk and offering brief SNAPW intervention during routine consultations. The protocol for the study has been previously described .
The intervention was designed and implemented on two levels: (a) service level and (b) client level.
The service-level intervention was delivered by University staff and consisted of four components:
A 1-day training program in the assessment and management of the SNAPW risk factors (including motivational interviewing) for participating community nurses delivered by the research team in conjunction with local providers. The training included the use of role-plays with simulated clients (actors), group discussions and activities;
Integration of standardised screening tools and prompts for SNAPW risk factors into the service-specific assessment processes used by the nurses in the management of clients;
Development and distribution of a local service referral directory to each community nursing team to promote referral of clients for ongoing specialist management or more / ongoing intensive lifestyle intervention; and
Provision of client resources to all participating nurses. The resources included a written guide for nurses, written action plans for use with clients on each SNAPW risk factor, tape measures for measuring waist circumference and pedometers for loan to clients to encourage self-monitoring of physical activity.
A nurse from each of the EI sites was seconded to work with the research team to develop the intervention and to support its implementation at the local level.
The client-level intervention was provided by the participating nurses. The goals of the clinical intervention were to achieve and maintain lifestyle changes consistent with current Australian recommendations :
Moderate physical activity for at least 30 minutes/day, including walking, jogging, swimming, aerobic activity, ball games, skiing, with circuit-type resistance training if possible, twice a week;
A diet low in saturated fats, sucrose and salt with increased portions of vegetables and fruit per day (up to seven portions) in order to achieve a diet where the percentage of energy from carbohydrates = 50%, saturated fats <10% (and total fats < 30%, protein 1 g/kg ideal body weight per day, fibre 15 g/1000 kcal);
Weight reduction (if overweight) of ≥ 5 kg or 5% of body weight;
Smoking cessation (if smoker);
Limit alcohol intake (if drinking) to ≤ 2 drinks / day, including 1–2 alcohol-free days/week.
Two of the four CN services were randomly allocated to the LI group. Late intervention services provided usual care for 18 months. After all data ad been collected the service level intervention was introduced into these services as well.
Selection criteria for recruiting clients to participate in the trial
* Clients referred to community nursing services
* Age 30–80 years
* Able to read and understand English at a level that enables the client to participate in a telephone-administered survey and to understand the participant information sheet.
* Palliative care clients.
* Clients receiving only one- visit or occasion of service.
* Clients with significant cognitive impairment (unable to complete telephone-administered survey).
* Clients currently receiving help in changing their lifestyle from a health professional (other than their GP) such as a dietitian or exercise physiologist.
* Clients currently attending a chronic disease management program such as cardiac rehabilitation, diabetes education program.
* Clients who have attended the generalist community nursing service in the previous 6 months (and therefore may have already received lifestyle intervention).
Study outcomes, measurements and data collection
Study outcomes and measurement
Change in mean physical activity score
Brief validated physical activity tool 
Change in mean alcohol intake score
Validated AUDIT-C tool 
Change in mean number of serves of fruit and vegetables
Validated questions from the NSW Health survey 
Mean weight change
Change in smoking status
Change in adequate levels of physical activity
Change in ‘at risk’ alcohol consumption
Change consumption of > =2 serves of fruit per day
Change in consumption of > =5 serves of vegetables per day
Progression in stages of change
On five point intentions scales 
At risk clients offered evidence-based advice to modify their risk factors
Recall over previous 3 months
At risk clients offered evidence-based referral to modify their risk factors
Recall over previous 3 months
Power and sample size calculation
The a priori sample size was 400 clients per group (n = 800). This was calculated based on estimates of change in mean risk scores of self-reported measures of lifestyle risk factors. This was sufficient based on a standard deviation from previous research , design effect of 1.8 and loss to follow up of 20% to detect the following changes in mean risk scores:-
1 portion of fruit and vegetables per day (based on sd 2.02)
1 unit of physical activity score (based on sd 2.13)
5 kg of self-reported weight loss (based on sd 14.95)
Univariate comparisons were made within group between baseline and 3 months and between groups for receipt of advice and referral. Change in readiness to change was categorised at 6 months and compared between groups. Statistical tests included t test for continuous variables and chi square test for categorical variables.
Change in clients’ lifestyle risk factors between the EI and LI (comparison) groups were evaluated using multilevel models which included a number of patient level covariates thought to possibly influence the outcomes . Three repeated measures of SNAPW were compared within clients . Multilevel linear regression analysis was conducted on physical activity score, diet score and weight. In the first model three levels were fitted which included: service (level 3), client (level 2) and time (level 1). The variance between services was found not to be significant. For each risk factor at 6 months, a two level regression model was fitted. This included the time and client as levels adjusting for baseline risk, intervention, linear time (0 = baseline; 1 = 3 months; 2 = 6 months), gender, age, employment status, reason for referral, mental health and physical health status, number of risk factors and physical limitation. The multilevel statistical models were fitted using MLwiN version 2.25 .
The project was approved by the Hunter New England Human Research Ethics Committee (Ref No 08/10/15/4.03), and ratified by the University of New South Wales Human Research Ethics Committee (HREC) and the Human Research Ethics Committees in each of the participating Area Health Services. The study was conducted in compliance with this Committees regulations and the Helsinki declaration. All participants provided full informed written consent for publication of findings from this research.
Characteristics of CN SNAPW trial clients at baseline
Total (n = 804)
Early interv (n = 425)
Late interv (379)
Aboriginal/ Torres Strait Islander
Language other than English
Unable to work (long-term sickness/ disability)
Retired from paid work
Self-rated health status Poor or Fair
Self-rated mental health status: Downhearted or blue
Most to all of the time
no risk factors
1 risk only
< 2 serves of fruit (n = 801)
<5 serves of veg (n = 796)
At risk alcohol consumption a (n = 804)
Smokers (n = 802)
Overweight (OW) (n = 785)
Obese (n = 785)
OW or obese (n = 785)
Unable to do physical activity (PA)b (n = 793)
Able to do PA but inadequate (n = 418)
The majority (61.6%) of clients rated their own health as ‘good, very good or excellent’ and 12.7% reported that during the past month they had felt ‘downhearted or blue’ most or all of the time. Almost all clients (97.6%) had at least one lifestyle risk factor and 101 (12.5%) had at least four (Table 3). At baseline 17.2% of participants reported being smokers, 78.5% had insufficient fruit and vegetable dietary intake, 74.0% were overweight or obese, 36.9% had at risk drinking levels. Of those who were able to engage in physical activity, 50.5% had inadequate levels. There were no significant differences between those in the EI and LI groups (Table 3).
Recall of lifestyle advice and referrals of clients identified with lifestyle risk factors at baseline and 3 months
Proportion of at risk clients recalling being offered advice or being referred to manage risk factors
%, ( 95%CI)
Offered advice from any provider
23.3 (18.1-28.5)* #
Physical activity (for those able to engage in PA)
Referral for SNAP intervention
Physical activity (for those able to engage in PA)
5.5% (0.8 – 10.2)
6.9% (2.5-11.2) *
There were significant increases in reported referrals for diet, physical activity and alcohol from baseline to 3 months in the EI group (from 9.5 to 15.6%, 5.8 to 21.0% and 1.2 to 6.9% respectively). There was no change in the LI group (Table 4). There were no significant differences between groups at three months.
‘Readiness to change’ of clients identified with lifestyle risk factors
Shift to higher change stage between baseline and 6 months for clients with SNAPW risk factors
Clients with SNAPW risk factors
Increase fruit and vegetable intake
Increase physical activity
Reduce alcohol consumption
Reduce or quit smoking
n = 101
n = 105
n = 57
n = 24
n = 18
n = 96
n = 97
Did not shift to a higher stage of change
Shifted to a higher stage of change
Chi square (one-sided)
p = 0.303
p = 0.032
p = 0.593
p = 0. 080
p = 0.132
Client self-reported risk factors
Overall, there were no significant differences in risk factors between EI and LI groups at baseline, 3 or 6 months.
SNAP risk factors scores at baseline, 3 and 6 months
Early mean 95%CI
Late mean 95%CI
Early mean 95%CI
Late mean 95%CI
Early mean 95%CI
Late mean 95%CI
Physical activity scoreb
Diet and physical activity scores and weight: multilevel regression models
Physical activity score
Diet Score (F & V Serves)
Time (1,2,3 = 0, 3 and 6 months)
General post hospital care
Mental health – good
Self-reported good health
No. of health conditions
No. of risk factors
This study demonstrated that community health nurses were able to implement lifestyle risk factor management as part of normal clinical practice. This individual support within PHC can complement broader population health approaches as part of a comprehensive approach to reducing cardiovascular risk factors across the population. Community health nurses are particularly well placed to deliver lifestyle interventions to high risk clients, many of whom have chronic disease and multiple behavioural risk factors.
The intervention was associated with an increase in the provision of brief diet and physical activity advice by community nurses. In qualitative interviews we found that this was a feasible addition to routine practice by the nurses which clients found acceptable [33, 34]. Whilst referrals were infrequent at baseline they increased following the intervention for diet and alcohol and physical activity in the EI but not the LI groups.
Despite modest improvements in preventive care, and some shift in readiness to change physical activity, there was no evidence of a significant impact of the intervention on the SNAP behaviours or weight of clients. It may be that brief interventions from community nurses is not sufficient to achieve change in lifestyle risk factors in this group of clients, many of whom were older, had existing chronic conditions, or were recovering from acute illness. An important factor may also be that many clients were seen following discharge from hospital, and the immediate post-acute phase might not be conducive to making lifestyle change. The intervention and follow-up period in this study was relatively short and it is possible that clients might have been able to make changes once they were fully recovered. These clients may require referral onwards to more intensive interventions at an appropriate time. This requires systems to be in place for assessment of readiness to change and referral to other services. However, this was not captured in the study.
Our negative findings are in contrast with other research in the effectiveness of brief lifestyles interventions in the PHC setting. Most of that research has been conducted in family practice, in services where the nurses were involved in the care of the clients in an ongoing way, or involved major input from referral programs or providers outside PHC [35–38]. However, only a minority of clients of community health nurses in this study received care for longer than 6 months. As has been noted, in the short term many clients had reduced capacity for physical activity because of their illness. Thus while community nurses have the opportunity to assess and initiate behavioural interventions, these need to be provided in the context of long-term care.
Another possible contributor to the negative finding may be related to the relatively high proportion of patients from lower two fifths of socioeconomic disadvantage of many community nursing service clients. This might suggest the need for intervention to address social and environmental factors at the community level. Certainly transport and cost was a major barrier to referral identified by the nurses themselves .
Following on from initial assessment and advice, clients who are ready to change need to be linked into longer-term care pathways which support them in changing their risk factors and maintaining them over time. The referral of clients to lifestyle interventions, programs and groups (i.e. Assist, the fourth ‘A’ in the 5As Model) might be a necessary step for many clients to achieve improved health outcomes and reduce risk factors [39, 40]. In this study at risk clients infrequently recalled having been referred and other research has identified numerous barriers to referral . The fifth ‘A’, Arrange follow up, is important in the maintenance of behaviour change even over the medium term. Prerequisites for these two actions include adequate availability and affordability of referral services, improved communication, and transfer of care between community health nurses and other providers involved in long-term care. These long-term providers may include the client’s GP, private or public allied health professionals, or other community services and programs. Critical to this transfer is clarity about who is prepared to take on the role of coordinating and monitoring the client’s lifestyle risk factors over months and years.
There are a number of limitations in the study that need to be acknowledged. The data are based on self-report by clients which may have introduced bias especially for weight. Nurses from the LI (comparison) sites commented that simply answering the initial survey prompted them to be more aware of the need to include addressing lifestyle risk factors in their professional care of their clients (i.e. the Hawthorne effect) . This may account for the improvement in physical activity and diet scores in both groups. This study adopted a quasi-experimental design because it was not feasible to randomise the intervention according to individual clients or practitioners within the services. The overall response rate could also have introduced bias affecting the generalisability of the findings, as more interested clients may have chosen to participate.
The study demonstrated that an intervention to provide community nurse training and support for management of clients’ SNAPW risk factors was associated with increases in advice and referral of clients with risk factors. This was associated with some improvement in client readiness for physical activity. There were no changes, however, in lifestyle behaviours or weight. This suggests a need to facilitate referral to more intensive interventions for clients with risk factors identified by community health nurses and for follow up by providers involved in long-term continuing care. This presents a challenge for the community health care sector and to current practices regarding communication and linkage between primary health care and other services in the Australian health care system.
The authors wish to acknowledge the former Centre for Health Advancement, NSW Ministry of Health for funding the study. This paper is presented on behalf of the CN SNAP project team which includes: S Buckman, K Partington, A Mitchell, H Smith, J Asquith, R Whittaker, M Hilkmann, C Lisle, K Caines, S Clark, S Dunn, B Christl, M Mangold and R Phillips.
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