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Association and causal mediation between marital status and depression in seven countries

Abstract

Depression represents a significant global public health challenge, and marital status has been recognized as a potential risk factor. However, previous investigations of this association have primarily focused on Western samples with substantial heterogeneity. Our study aimed to examine the association between marital status and depressive symptoms across countries with diverse cultural backgrounds using a large-scale, two-stage, cross-country analysis. We used nationally representative, de-identified individual-level data from seven countries, including the USA, the UK, Mexico, Ireland, Korea, China and Indonesia (106,556 cross-sectional and 20,865 longitudinal participants), representing approximately 541 million adults. The follow-up duration ranged from 4 to 18 years. Our analysis revealed that unmarried individuals had a higher risk of depressive symptoms than their married counterparts across all countries (pooled odds ratio, 1.86; 95% confidence interval (CI), 1.61–2.14). However, the magnitude of this risk was influenced by country, sex and education level, with greater risk in Western versus Eastern countries (β = 0.36; 95% CI, 0.16–0.56; P < 0.001), among males versus females (β = 0.25; 95% CI, 0.003–0.47; P = 0.047) and among those with higher versus lower educational attainment (β2 = 0.34; 95% CI, 0.11–0.56; P = 0.003). Furthermore, alcohol drinking causally mediated increased later depressive symptom risk among widowed, divorced/separated and single Chinese, Korean and Mexican participants (all P < 0.001). Similarly, smoking was as identified as a causal mediator among single individuals in China and Mexico, and the results remained unchanged in the bootstrap resampling validation and the sensitivity analyses. Our cross-country analysis suggests that unmarried individuals may be at greater risk of depression, and any efforts to mitigate this risk should consider the roles of cultural context, sex, educational attainment and substance use.

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Fig. 1: Study design.
Fig. 2: Unmarried individuals have a significantly higher risk of depressive symptoms than their married counterparts (all P < 0.01).
Fig. 3: Modification effects on the association between marital status and depressive symptom risk.
Fig. 4: The direct and indirect causal associations between marital status and later risk of developing depressive symptoms, mediated by alcohol drinking and smoking.
Fig. 5: Bootstrap resampling (n = 100 times) demonstrating the robustness of probit-regression-based causal mediation analysis.

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Data availability

Data from the NHANES are available at https://www.cdc.gov/nchs/nhanes/index.htm. Data from the WLS are available on the application at https://wls.wisc.edu/. Data from the APMS are available on the application at https://ukdataservice.ac.uk/find-data/. Data from the MHAS are available on the application at https://www.mhasweb.org/Home/index.aspx. Data from KLoSA are available on the application at https://survey.keis.or.kr/eng/klosa/klosa01.jsp. Data from TILDA are available on the application at https://tilda.tcd.ie/. Data from CHARLS are available on the application at https://charls.pku.edu.cn/. Data from the IFLS are available on the application at https://www.rand.org/well-being/social-and-behavioral-policy/data/FLS/IFLS.html.

Code availability

The computational code for causal mediation analysis with bootstrap resampling is shared at https://github.com/Li-OmicsLab/Causal_NHB.

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Acknowledgements

We thank each of the survey teams and study participants who made this analysis possible. This study was supported by grants from Macao Polytechnic University (RP/FCSD-02/2022 and RP/FCA-14/2023, H.H.Y.T. and K.L.) and a special grant for COVID-19 prevention and control from the Department of Education, Shanxi Province (J.L.). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

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X.Z., L.S.W., C.W. and K.L. conceived and designed the study. X.Z., H.H.Y.T., A.X., C.K.L., Y.S., G.L., W.M., M.Z., Y.H. and J.L. collected and analysed the data. X.Z., H.H.Y.T., A.X. and K.L. drafted the paper. M.Z., Y.H., L.S.W., C.W. and K.L. critically reviewed and edited the paper. All authors reviewed and approved the final version.

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Correspondence to Cuicui Wang or Kefeng Li.

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Nature Human Behaviour thanks Amanda Hughes, Azra Ramezankhani and Fan Wang and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Zhai, X., Tong, H.H.Y., Lam, C.K. et al. Association and causal mediation between marital status and depression in seven countries. Nat Hum Behav 8, 2392–2405 (2024). https://doi.org/10.1038/s41562-024-02033-0

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