Life time suicidal thoughts in an urban community in Hanoi, Vietnam

Data collection

From March to May 2003, we conducted a questionnaire survey among residents of Dong Da, the largest and most populated district of Hanoi, Vietnam. A simple random sample (a sampling procedure that ensures that each person in the population has a chance of being selected), using a table of random numbers, yielded 2,400 subjects that were selected from the list of district residents (numbering some 350,000). This list was compiled from the lists from all the municipalities in the Dong Da district, provided by the respective municipal People's Committees. No exclusion criteria were applied, except that the subjects were aged 14 or more. There are 4 persons who were treated in out-patient departments for mental disorders were also excluded from the study. The selected subjects were contacted by the staff of the municipal People Committee to make the appointment for the interviewers' visits. At each visit to the subject's home, the interviewer approached the potential participant, briefly described the study and requested their participation. A total of 2,280 subjects agreed to take part, resulting in a participation rate of more than 94%. 2,260 participants who responded to questions about suicidal thoughts and suicide attempts are included in the analyses. General characteristics of the study material are presented in the results.

Instrument

Participants were interviewed face to face, using the SUPRE-MISS community survey questionnaire [14]http://www.who.int, translated into Vietnamese and adapted by a group composed of psychiatrists, psychologists and professionals in public-health sciences at Hanoi Medical University and the National Institute for Mental Health in Vietnam. The questions elicited detailed sociodemographic background information and explored respondents' suicide-related behavior, physical health, emotional problems and use of drugs and alcohol.

The questions concerning suicidality were as follows, for the respondent's lifetime and the last 12 months:

• "Have you ever seriously thought of committing suicide?"

• "Have you ever made a plan to commit suicide?"

• "Have you ever attempted suicide?"

The questions concerning to emotional problems was as follow:

• "Do you or did you ever experience for prolonged periods of time (for over at least one year) troubles within yourself that hindered your functioning? (e.g.: fears of places, anxiety, depressive feeling, hopelessness...)

The DRUG CARD is used for getting information on habit using alcohol, sleeping pills, pain relief medication in life time [14]. The DRUG CARD includes tobaco products, alcoholic beverages, marijuana, cocain, stimulants, inhalants, sleeping pills, hallucinogens, heroin, pain medication.... and the question concerning to the habit using these kind of drug was as follow:

• " In your life, which of the following substances (see DRUG CARD) have you ever used?"

Interviews

A group of eight students in their final year of studying public health at Hanoi Medical University were carefully trained in the use of the questionnaire and interview techniques. The interviewers had a regular debriefing and training meeting throughout the study.

Quality and reliability control

The interview process was monitored, checked and retested. Approximately 10% (200 persons) of the 2,280 subjects were selected randomly for reliability tests. Interviews were performed by telephone and sometimes repeated (test/retest). All the variables were tested and results were the same.

Ethical approval

Participation in the study was anonymous and voluntary. Ethical approval was obtained from the Ministry of Health in Vietnam, Hanoi Medical University and the Ethical Committee at Karolinska Institute in Stockholm, Sweden. Each participant signed a consent form agreeing to take part in the study.

Statistical analyses

Data were entered by two different persons using SPSS version 10 (SPSS Inc., Chicago, IL) and analysed using Stata version 8 (Stata Corp, College Station, TX). General characteristics of the study material were analysed by descriptive analyses. Comparisons of proportions between groups were conducted using χ² tests. Income was categorized into two levels, high and low, based on the median. Since the numbers of "widowed" and "divorced/separated" people were small, we combined these categories with "single" to make an "Unmarried" category. Similarly, for the subjects' religion, we combined "Protestant", "Jewish", "Muslim", "Greek Orthodox" and "Other" in the "Others" category. Multivariate logistic regression was used to examine the associations of independent variables with suicidal thoughts, simultaneously adjusting for potential confounders. Variable selection in the multivariate model was based on results presented in previous studies [18, 19] and the most fitted model was selected.

* General characteristics

* Prevalence of past suicidal thoughts

The incidence of suicidal thoughts, suicide plans and suicide attempts during a lifetime was 22.3:2.8:1 (201:25:9 in Table 2). For the past 12 months, this ratio was 24.7:4.0:1 (74:12:3 in Table 2)

* Suicidal thoughts and physical illness or symptoms

Twelve of the 201 (6%) people with suicidal thoughts had had chronic joint pain for at least a year. Members of the group with suicidal thoughts had also suffered from headache (4 persons), cancer (3), stomach ache (3), asthma (2), and hepatitis (2). In the group without suicidal thoughts, 71 had chronic joint pain, 22 headaches, one cancer, 34 stomach aches, two asthma and three hepatitis. Although the proportion of respondents with physical illnesses in the "suicidal thought group" was often higher than that of the "non-suicidal thought groups", these differences are not statistically significant, except for asthma (P < 0.05) and cancer (P < 0.01).

* Suicidal thoughts and feelings of anxiety, depression and fear for at least one year

In the group who had suicidal thoughts, there were 13 (6.5%) persons with feelings of anxiety, 12 (6.0%) persons who had experienced depression and 6 (3.0%) participants who had felt fear for at least one year. The number of respondents with non-suicidal thoughts was 20 (1.0%) with anxiety, 17 (0.8%) with depression and 2 (0.1%) with fear. The difference between two groups with respect to each kind of feeling is statistically significant (p < 0.01).

* Correlates of suicidal thoughts

Methodology

In this investigation, face-to-face interviews were conducted. This procedure not only allows any misunderstanding of the questions to be clarified, but also helps to prevent non-participation. Some previous studies using questionnaires sent by post or administered by telephone have shown higher participation refusal rates than in this study [20, 21]. Even though the analysis of the data was anonymous to the researchers, and thus de-identified, the participants were not anonymous during the sampling prosedure. The answeres given might differ from data given in a totally anonymous situation. The procedure of training, pilot study, monitoring, checking, and retesting was conducive to inter-interviewer reliability.

However, the perception by the interviewed person that the interviewers were the part of the Commune' People Committee and the role of stigma cannot be ruled out. The rate of suicidal thoughts reported in the study was nearly 8.9%, but the real proportion may be higher for several conceivable reasons. People cannot remember suicidal thoughts throughout their lives, especially if no particular events take place to remind them of these thoughts. Beyond issues of memory, cultural aspects may have affected people's willingness to inform others that they have had suicidal thoughts or attempted suicide in their lifetime. This factor is assumed to be prevalent in Asian countries [22, 23].

The procedure of training, pilot study, and re-testing assured the inter-interviewer reliability. Understanding the meaning of questions on suicidal thoughts can also cause the problem of the reliability of the obtained results. A particularly low rate of lifetime suicide attempts (0.4%) calls for further investigation. The problem of bias due to social desirability of respondents is a well known phenomenon in this kind of studies [24].

The study design is a cross-section survey, so no conclusions could be drawn concerning the causality between suicidal thinking and other factors. Nonetheless, it helps to indicate a direction for further longitudinal studies.

Suicidal thoughts, suicide plans and suicide attempts during lifetime and past 12 months

Lifetime prevalence for suicidal thoughts varies among countries, and ranges from 2.1% to 18.5% in studies of nine countries [23]. The rates of suicidal thoughts on a lifetime basis and/or in the past twelve months are lower in our study than in studies in Western countries [23, 25] and China but higher than in India [14]. This may be due to cultural differences but also, in part, to the methodology used. In the nine-country study [23], for example, the Diagnostic Interview Schedule, Version III and the DSM-III were used and suicidal thought was assessed by the question" Did you ever feel so low you thought of committing suicide?" which differs from the questions about suicidal thoughts used in this study [14]. The prevalence of suicide attempts in Vietnam was the lowest among countries within the SUPRE-MISS framework, when the same methodology was used [14]. But, Vietnam reported more serious suicide attempts, based on the self-evaluation of seriousness in comparison with answers from the general population in other countries [14]. Real suicide rate in Vietnam is unknown because the rate reported by the Ministry of Health is based only on hospital data. However, most of suicides occur outside the hospital systems. There is no national system to monitor causes of death, including suicide in Vietnam. Therefore, surveillance and registration of suicide and other causes of death should be developed.

The ratio of suicidal thoughts, suicide plans, and suicide attempts in Vietnam was 22.3:2.8:1 on a lifetime basis. Suicidal thoughts are 7 times more prevalent than suicide plans, while the latter are only approximately three times as common as suicide attempts. There is the same ratio between suicide plans and suicide attempts in Vietnam (2.8:1) as in China, Australia, Stockholm but different from India, Brazil, Sri Lanka, Iran and Estonia where ratio between suicide plans and suicide attempts is in the range between 1:0.7 to 1:1.7 [14]. The ratio between suicidal thought and suicide attempts in Vietnam is 22.3: 1 which differs from Western and other Asian countries, where the ratio between suicidal thoughts and suicide attempts is smaller. A future in-depth study will be undertaken to understand the reasons for the differences.

Correlates of having suicidal thoughts

In our urban Vietnam sample, female gender is strongly associated with suicidal thoughts compared with male. This result is consistent with most of previous studies [25]. In contrast to our finding, the Finnish study reported a higher prevalence of suicidal thoughts in men than in women [26].

Suicidal thoughts are associated with single marital status or life events such as divorce, widowhood and separation. Marriage seems to be a protective factor for suicidal thoughts. These factors have, in fact, been identified in various studies in Asian and Western countries alike [22, 27–29].

In our study, the results show that participants who followed the Buddhist religion experienced less suicidal thought than those who either had no religion or followed other religions (Muslim, Protestant, Jewish). Most Vietnamese people are strongly influenced by Buddhist practices, even if they do not openly admit that they are Buddhists [30]. This cultural and religious tradition may possibly explain the low level of suicidal thoughts and suicide attempts in Vietnam compared with other countries [14, 23].

Suicidal thoughts in this study were frequent in young adults. The results of our previous study on hospitalised suicide attempters [17] showed that the largest group of patients was the group aged 15–24 years.

Several previous studies found the correlation between low income, unemployment with suicidal thought [27, 31]. It is similar to the results in this study, which show that there are only 1.4% of respondents who are unemployment but there are 44.4% who report that they have a low level of income. The unsolved financial problems for a long time can lead to distress and depression symptoms. Poor economy influences also the access to the health care service in the developing countries as Vietnam.

Suicidal thoughts and mental problems, use of alcohol, sedatives and pain relief medication

The result of our study show that nearly 90% of respondents never used sedatives or pain relief medication in their life. The habit of using this kind of medication might be a protective factor for suicidal thought in Vietnam.

Prolonged feelings of anxiety, depression and fear are predictors for suicidal thought. This research calls for training of primary health workers, and this is consistent with the WHO strategies for suicide prevention [32]. It is well known that many people who suffer from stress and mental problems over long periods do not come to the health services' attention [7] This may be connected with taboos or diverse cultural aspects of mental illness in Vietnam, but also due to a general lack of knowledge about diagnostics and treatment of mental illness [33].

Suicidal thinking is related to the use of sedatives and these kinds of medicines are a frequent means of attempting suicide in Vietnam [17]. Public-health approaches that call, for example, for careful management of medication of this kind or selling smaller pack sizes are suggested as effective means of preventing suicidal behavior [34].

Suicidal thought is highly correlated with use of alcohol on a lifetime basis. Studies from non-Asian countries illustrated the same findings [10, 35]. But in our previous study, alcoholism and alcohol addiction were rarely found in hospitalized suicide attempters [17] which may be due to the lack of attention by doctors to diagnose alcohol misuse and abuse.

Suicidal thoughts and physical health

Suicidal thoughts and attempted suicide are related not only to depression and other mental disorders, but also to general medical illnesses ranging from terminal diseases such as cancer and AIDS to acute life-threatening illnesses such as stroke, traumatic brain injury and spinal cord injury, and also more widespread illnesses, such as asthma and chronic bronchitis [9]. Although the numbers of cancer and asthma patients in our study were small as they were not selected from the hospital, suicidal thoughts were found to be significantly more frequent in these groups. The results indicate the need of paying attention to suicidal thoughts when treating somatically ill patients and the need for further studies focusing on hospitals.