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Effect of social mobility in family financial situation and housing tenure on mental health conditions among South Australian adults: results from a population health surveillance system, 2009 to 2011

BMC Public Health volume 15, Article number: 675 (2015) Cite this article

Abstract

Background

To assess the association of socioeconomic position (SEP), measured by family financial situation and housing tenure in childhood and adulthood, with mental health conditions in adulthood.

Methods

Representative cross-sectional population data were collected using a risk factor surveillance system in South Australia, Australia. Each month, a random sample were selected from the Electronic White Pages. Participants aged 25 years and above (n = 10429) were asked about doctor diagnosed anxiety, stress or depression, suicidal ideation, psychological distress, demographic and socioeconomic factors using Computer Assisted Telephone Interviewing (CATI). Social mobility measures were derived from housing status and perceived financial situation during adulthood and at 10 years of age.

Results

The prevalence of psychological distress was 8.1 %, current diagnosed mental health condition was 14.8 % and suicidal ideation was 4.3 %. Upward mobility in family financial situation and housing tenure was experienced by 28.6 % and 19.3 %, of respondents respectively. Downward mobility was experienced by 9.4 % for housing tenure and 11.3 % for family financial situation. In the multivariable analysis, after adjusting for age, sex, childhood family structure and adult education, downward social mobility and stable low SEP (both childhood and adulthood), in terms of both housing tenure and financial situation, were positively associated with all three mental health conditions.

Conclusion

People with low SEP in adulthood had poor mental health outcomes regardless of their socioeconomic circumstances in childhood. Policies to improve SEP have the potential to reduce mental health conditions in the population.

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Background

Mental health disorders present a significant public health burden and an estimated cost of over $6 billion per annum in Australia [1]. The lifetime prevalence of mental health disorders among Australians aged 16 to 85 years was 45 % in 2007, and one in five experience more than one mental disorder over a 12 month period [2]. Mental health disorders are a leading cause of disability burden in Australia, accounting for an estimated 24 % of the total years lost due to disability [3].

Socioeconomic and psychosocial environments have been associated with mental health [2, 4–6]. Cross-sectional studies in Australia have shown that current socioeconomic circumstances (low educational attainment, low household income, unemployed or unable to work) are associated with poor mental health [2, 6] but they do not include childhood social or economic circumstances measures that may influence adult mental illness. Life course approaches are being used to explain the development of poor mental illness in adulthood by examining the “long term effects on later health or disease risk of physical or social exposures during gestation, childhood, adolescence, young adulthood and later adult life” [7]. International studies have examined the relationship between socioeconomic position (SEP) in childhood and adulthood and mental illness [5, 8–11]. There are studies that have found no relationship between childhood SEP and poor mental health in adulthood when SEP in adulthood is taken into account [12, 13] but other studies have found associations with childhood SEP [11, 14, 15].

Several conceptual models have been developed to explain the effects of SEP over the life course on the development of health; one being the “mobility in the social structure of society” or social mobility [16, 17]. Simply, (intergenerational) social mobility refers to the change in SEP between generations: those who are disadvantaged in early life, based on the parents’ SEP, and remain disadvantaged through adulthood; those who are disadvantaged in early life but advantaged during adulthood (upward mobility); those who experience downward mobility from childhood to adulthood; and those who are advantaged during both early life and adulthood. It has been suggested that SEP in childhood can have a lasting effect on mental health in adulthood and people in different social mobility groups over the life course have varying health outcomes, with the downwardly mobile having poorer health, compared to those who maintained a high level of SEP across early life and adulthood [17, 18]. Many indicators have been used to measure early life SEP to ascertain social mobility: parental or family “material circumstances”; that is, the homes and neighbourhoods in which they can afford to live and by the living standards their income secures, such as occupational status, household income, and housing tenure [5, 19–21]; parental education since it is a mechanism to improve SEP [9, 20, 22]; and factors such as perceived job demands, job insecurity, perceived financial hardship, access to a car, healthier foods or computers, which are not limited to the basic material conditions [14, 21]. Some studies have examined how social mobility according to occupation or education of parent (s) and the individual in adulthood [8, 11, 12] is related to mental health in adulthood. Luo et al. [12] found that respondents who were upwardly socially mobile between childhood and adulthood had better mental health outcomes than respondents experiencing socioeconomic disadvantage across childhood and adulthood. They concluded that the impact of low SEP in childhood can be ameliorated if people experiencing low childhood SEP achieve higher status in adulthood.

The use of data from a representative population health surveillance system provides a large sample size to enable us to investigate differences in health and illness between different population groups and for monitoring the impact of policies and interventions aimed at reducing health inequities and intergenerational disadvantage over time [23, 24]. This paper aims to examine the association of three measure of mental health illness (psychological distress, self-reported diagnosed current mental illness, and suicidal ideation) among people who were socially mobile (upward or downward) between childhood and adulthood, with retrospectively recalled information about childhood family financial situation and housing tenure.

Methods

Sample

The study used data from the South Australian Monitoring and Surveillance System (SAMSS) collected between January 2009 and June 2011 for respondents aged 25 years and over. SAMSS, established in 2002, is a monthly telephone survey designed to systematically monitor the trends of health conditions, behavioural risk factors and other health services issues over time for the South Australian (SA) health system [25]. SAMSS utilises Computer Assisted Telephone Interview (CATI) method whereby a minimum of 600 randomly selected people of all ages each month are interviewed by trained health interviewers. All households in SA with a telephone connected and the telephone number listed in the telephone directory are eligible for selection. A letter introducing the survey is sent to the selected household and the person with the last birthday is chosen for interview. There are no replacements for non-responders. Up to ten call backs are made to the household to interview the selected persons. A total of 18430 interviews were conducted (64.7 % response rate) among respondents of all ages for the period January 2009 to June 2011. Ethical approval was obtained from SA Health and The University of Adelaide. All participants gave informed consent.

Mental health outcomes

Psychological distress was determined using the Kessler 10 which are 10 questions based on the level of anxiety and depressive symptoms experienced in the previous four weeks at the time of the interview [26, 27]. The response categories are on a five point Likert scale ranging from ‘all of the time’ to ‘none of the time’, Each item was reverse scored (value 1 for ‘none of the time’ to 5 for ‘all of the time’ and summed to give scores ranging from 10 (no distress) to 50 (high risk of anxiety or a depressive disorder). Participants with low scores between 10 and 21 were deemed not to have psychological distress, while those with high scores between 22 and 50 were categorized as having psychological distress [2, 6]. Current self-reported diagnosed mental health condition was defined as being diagnosed by a doctor in the previous 12 months with anxiety, depression, a stress related problem or another mental health problem and/or currently receiving treatment for a mental health problem. Suicidal ideation was determined using four items drawn from the severe depression subscale of the 28-item General Health Questionnaire (GHQ-28) [28]. The suicidal questions were scored by applying the binary method to the four questions to produce a score ranging from 0 to 4 where a score of 1 or more indicated suicidal ideation [29]. Suicidal ideation is considered to be a necessary but not sufficient precursor to successful (or unsuccessful) suicide or suicide attempts including thoughts and preliminary actions [29].

Socioeconomic position (SEP)

Previous work [23, 24] investigated a range of early-life SEP questions and found that questions on housing tenure and financial situation during childhood were suitable to include into a surveillance system like SAMSS. These questions complement existing questions on current SEP, and were found to have lower item non-response (1.7 % for housing tenure and 9.0 % for financial situation) compared to other SEP questions such as parental education (20.1 % for mother and 19.6 % for father) [24]. These early-life SEP questions were included from 2009. Respondents were asked about their housing tenure and financial situation currently and when they were 10 years old [30]. For family financial situation, high SEP was indicated by “being able to save a bit or a lot,” and low SEP was indicated by “not being able to save any money at all.” For housing tenure, living in a dwelling that the respondent or other family members owned or were purchasing indicated high SEP, and low SEP was indicated by living in a dwelling that was rented privately or from the government housing authority or having other housing circumstances. These two measures on social mobility according to financial situation and housing tenure were considered over other possible measures (parents’ education or occupational status) since they have been shown to have low item non-response and fewer differences between those who could and could not recall [24, 30]. Two social mobility variables were created from current and childhood financial situation and housing tenure. Each social mobility variable comprised four possible intergenerational trajectories: stable high, low in childhood and high in adulthood (upward mobility), high in childhood and low in adulthood (downward mobility), and stable low.

Covariates

Demographic variables included age, gender and family structure at age 10. Other variables included highest level of education and the number of chronic conditions, which was derived from five co-morbidities: medically confirmed diabetes, current asthma, cardiovascular disease (heart attack, angina, heart disease and/or stroke), arthritis and osteoporosis. Health risk factor data included smoking status, body mass index (BMI) derived from self-reported weight and height and recoded into four categories (underweight, normal weight, overweight and obese) [31], and alcohol risk over a lifetime [32].

Statistical analyses

There were 12567 respondents aged 25 years and over between January 2009 and June 2011. Analyses were conducted using respondents with complete data on mental illness, SEP and covariates (n = 10429). Missing items were mainly for respondents who could not answer or refused their financial situation at age 10 years (11.4 %), current financial situation (2.5 %) and dwelling status at age 10 years (2.4 %).

Analyses were conducted using SPSS Version 19 and Stata Version 12. Univariable analyses using chi-square tests compared the prevalence of each mental health condition across SEP demographic and health indicator variables. Associations between social mobility on family financial situation and housing tenure and each mental health condition were analysed using logistic regression models, adjusted for multiple covariates using SPSS. Model 1 adjusted for age and sex; family structure at age 10 was added in Model 2. Other variables including highest education level, chronic conditions, smoking, alcohol, and BMI were not adjusted for in these models as they were considered to be on the causal pathway between early life SEP and having a mental health condition in adulthood. The adjusted (age, sex, and family structure at age 10) predicted probability of having a mental health condition (psychological distress, self-reported mental health condition and suicidal ideation) by social mobility variables was calculated using logistic regression and presented using marginsplot syntax in Stata.

Data were weighted by area (metropolitan/rural), age, gender and probability of selection in the household to the most recent SA population data so that the results are representative of the SA population.

Results

A description of the characteristics of respondents is shown in Table 1. Few differences existed between the response sample and analysis sample (table not shown). The prevalence of psychological distress was 8.1 % (95 % CI 7.6-8.7), current diagnosed mental health 14.8 % (95 % CI 14.1-15.5) and suicidal ideation was 4.3 % (95 % CI 3.9-4.7). The distribution of social mobility variables shows 28.6 % of respondents experienced upward mobility in family financial situation, and 19.3 % experienced upward mobility in housing tenure. Downward mobility was experienced by 11.3 % and 9.4 % for family financial situation and housing tenure, respectively.

Table 1 Prevalence and sample sizes for mental health outcomes, social mobility and sociodemographic variables, 25 years and over
Full size table

Table 2 details the univariable associations between the three mental health conditions and social mobility, sociodemographic and health indicators. Those who had high SEP in both childhood and adulthood had the lowest prevalence of mental health conditions, and those with low SEP in both childhood and adulthood had the highest prevalence of mental health conditions. Respondents experiencing upward mobility had better mental health outcomes than those with low SEP in both childhood and adulthood. Mental health conditions were higher among respondents with lower educational attainment, and those who were current smokers, classified as obese, had chronic conditions, or had a step, blended family or sole parent family during childhood.

Table 2 Univariable analyses of mental health conditions by social mobility, socio-demographic and health-related variables (n = 10429), 25 years and over
Full size table

Using multivariable analysis (Table 3), after adjusting for age and sex, and childhood family structure (Model 2), downward social mobility between childhood and adulthood, in terms of both housing tenure and financial situation, was associated with each mental health condition. Respondents experiencing low SEP during both childhood and adulthood were also more likely to experience all three mental health conditions. Upwardly socially mobile respondents were no more likely to experience a diagnosed mental health condition than respondents experiencing high SEP during both childhood and adulthood. Similarly, these findings are reflected in Fig. 1, which shows the effects of each category of social mobility by computing the adjusted predicted probability of having a mental health illness (using the three measures) after adjusting for age, sex, and childhood family structure. The probability of having a mental health condition increases for people experiencing low SEP in adulthood regardless of SEP during childhood using family financial situation.

Table 3 Social mobility related to dwelling status and financial situation and risk of mental health conditions, 25 years and over
Full size table
Fig. 1
figure 1

Adjusted probability of mental health illnesses (psychological distress, self-reported diagnosed mental health condition, and suicidal ideation) by social mobility (dwelling status and financial situation), aged 15 years and over. Note: Derived using the MARGINS command in Stata version 12.0 based on logistic regression models adjusted by age, sex, family structure at age 10; ‘*’ denotes social mobility category significantly different from stable high category (χ2 test, p<0.05) using contrast option in Margins

Full size image

Discussion

This study used representative cross-sectional population data from a surveillance system and demonstrated that people with low SEP in adulthood were more likely to experience poor mental health outcomes regardless of their family financial situation or housing tenure in childhood. Even when controlling for the effects of family structure at age 10 the association between low SEP in adulthood (downward mobility and stable low SEP) and mental health illnesses decreased by only 1 to 9 %.

These findings imply that policies to improve housing and providing financial support could have a positive influence on mental health outcomes in the population, to which there is no simple singular answer. To improve housing for both renters and owners is a complex undertaking which has been shaped over many decades through various interactions between legislation or regulation, government policies (state and federal), local and global market forces (for example the 2008 Global Financial Crisis) and family needs in terms of physical requirements and psychosocial needs such as privacy, safety and security [33]. Continual housing assistance programs including public housing and rent assistance for families has long-term benefits in terms of improved access to education, employment and income levels [34, 35]. Other studies have suggested better mechanism for first home buyers and policies to adapt to the ongoing risks (unemployment, reduced work hours, rise in interest rates, unexpected illness) faced by home owners with a mortgage who are financially stressed [33, 36]. Even though financial stress or the difficulties regarding housing tenure cannot be eliminated, programs to develop resilience and coping skills can be taught and possibly reduce mental illness later in life.

The association of downward social mobility with poorer mental health in this study is similar to a previous study of Norwegian men, where suicide and schizophrenia disability were associated with a combination of high parental and low own education level [11]. In a longitudinal study of older Americans, people experiencing upward social mobility had similar levels of depressive symptoms to those experiencing relatively high socioeconomic circumstances across the life course [12]. Cumulative effects of adult SEP on mental disorders were also not influenced by adjustment for childhood SEP in analyses of the 1958 British Birth Cohort [37]. Even taking into account education, which has been shown to influence SEP in adulthood [37, 38], poor mental health was more prevalent among those with low SEP in adulthood.

To our knowledge, this is the first paper of its kind in the Australian context and is unique in having a large sample on the general population so that the conclusions are likely to be generalizable to the Australian population. The prevalence of each mental health condition in this study was comparable to other Australian population estimates [2, 39–41]. The large sample size enable us to examine associations of SEP with suicidal ideation, an outcome of low prevalence. The design of this study is reliant on retrospective self-reported SEP data, and the memory of participants could result in over-or under-reporting of early life circumstances, with a high proportion unable to recall these circumstances. As a result, this could weaken the observed associations. The choice of these SEP variables at age 10 were based on previous studies that measured performance in recall; including how easily and accurately these circumstances were recalled, whether the indicators have the same meaning over time and for different population groups such as migrants and older people, and indicators that minimised socially desirable responses (for example embarrassment of early childhood circumstances) [13, 24, 42]. This study demonstrated that having missing responses for childhood housing tenure and family financial situation was associated with a few variables [24, 42], making recall suitable for inclusion in a surveillance system like SAMSS. However, these studies did not examine the accuracy of recall of childhood housing tenure and family financial. Other measures of childhood SEP, including parental education and occupation, have been shown to be less well recalled by adults [24] and are not included in this surveillance system. While 17 % of the response sample was excluded from analyses because of missing responses, few differences existed between the response and analysis samples. Missing data were mainly due to those who could not recall childhood circumstances: 2.2 % could not recall their housing situation and 11.4 % did not state or could not recall their family financial situation when they were 10 years of age. A small proportion (0.7 %) were excluded because their childhood circumstances were atypical, for example, in an orphanage, concentration camp, institution, displaced, refugee.

Another limitation of this study using self-reported data, is that the respondents may provide socially desirable responses, which may result in the under-reporting of having a mental health condition. Clinical assessment of mental health outcomes would be ideal but is costly and resource intensive, especially in a population surveillance system such as SAMSS. Using a mental health service or professional as an indicator is problematic as middle aged people are higher service users compared to the younger age group which has the highest prevalence [6]. Hence, our study is reliant on established, validated instruments such as Kessler 10 for psychological distress or GHQ-28 for suicidal ideation that are suitable for assessment via the telephone. Furthermore, due to the cross-sectional nature of the study, the mental health instruments focus on the most recent four week prior to the interview, or current treatment, therefore, they only measure current mental health status; not past mental health episodes. Again, this could result in under-estimation of the strength of the association. Our study was unable to adjust for factors (were not included in SAMSS) which have been shown to contribute to mental illnesses in adulthood. These include family history of mental illness, family relationships or social networks during childhood, childhood mental illness [43] and factors such violence, abuse, neglect, lack of family cohesion [38, 44]. Possibly, those with poor physical and mental health are more likely to experience downward social mobility or a barrier to upward mobility [45]. Possible bias from using only listed telephone numbers can be considered a weakness of this study. Although telephones are connected to a large number of Australian households, not all are listed (mobile-only households and silent numbers) whereby 9 % of South Australian households are mobile-only and 69 % of households do not have their landline or mobile number listed [46]. Previous work has shown that inclusion of unlisted landline numbers in the sample did not impact on the health estimates [47]. The proportion of mobile-only households have increased in South Australia to 21 % as of 2011 [48, 49] with a very small proportion (4 %) listed in the telephone directory [46]. The impact on health estimates by excluding this group from the sample in Australia is unknown to date. However, the characteristics of people living in mobile-only households have been found to be distinctly different. Hence, potential bias may exist in the estimates obtained in this study.

Conclusion

Aside from the cross-sectional nature and limitations, this study has provided a useful, albeit simplified, foundation to the understanding of the relationship of SEP and mental health over the life course. The opportunity to reduce poor mental health in adulthood may be achieved by improving and providing continual support for housing affordability and security, and minimising financial stress hence decreasing socioeconomic disadvantages. With the recent economic situation, there is a possibility of more people experiencing downward social mobility and increased resources need to be allocated to prevent or treat mental health, hence, reducing the burden on health services. With a surveillance system like SAMSS, future analyses can monitor prevalence of mental health conditions in the population to determine if policies aimed at addressing mental health issues have been effective, in particular for specific social mobility subgroups.

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Acknowledgements

SAMSS is owned by SA Health, Department of Health and Ageing, South Australia, Australia. All collected source data are maintained, administered and managed by Population Research and Outcomes Studies, Discipline of Medicine, The University of Adelaide. The opinions expressed in this work are those of the authors and may not represent the position or policy of SA Health.

Author information

Authors and Affiliations

  1. Population Research and Outcome Studies, Discipline of Medicine, The University of Adelaide, SAHMRI, Level 7, North Terrace, 5005, Adelaide, Australia

    Eleonora Dal Grande, Jing Wu, Zumin Shi & Anne W. Taylor

  2. School of Population Health, The University of Adelaide, Adelaide, Australia

    Catherine R. Chittleborough

  3. Discipline of Psychiatry, The University of Adelaide, Adelaide, Australia

    Robert D. Goldney

Authors
  1. Eleonora Dal Grande
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  2. Catherine R. Chittleborough
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  3. Jing Wu
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  4. Zumin Shi
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  5. Robert D. Goldney
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  6. Anne W. Taylor
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Corresponding author

Correspondence to Eleonora Dal Grande.

Additional information

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

EDG Participated in the design and co-ordination of the study, performed statistical analyses, drafted the manuscript. CRC, ZS, JW, AWT Participated in the design and co-ordination of the study, advise on analyses, and were involved in the drafting and revising of the manuscript. RDG Participated was involved in the drafting and revising of the manuscript. All authors read and approved the final manuscript.

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Dal Grande, E., Chittleborough, C.R., Wu, J. et al. Effect of social mobility in family financial situation and housing tenure on mental health conditions among South Australian adults: results from a population health surveillance system, 2009 to 2011. BMC Public Health 15, 675 (2015). https://doi.org/10.1186/s12889-015-2022-9

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  • DOI: https://doi.org/10.1186/s12889-015-2022-9

Keywords

BMC Public Health

ISSN: 1471-2458

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