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J Affect Disord. 2018 Jan 1;225:260-264. doi: 10.1016/j.jad.2017.08.006. Epub 2017 Aug 12.

Major depression and secondhand smoke exposure.

Author information

1
Department of Community Health Sciences, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, Canada T2N 4Z6; Department of Psychiatry, University of Calgary, Canada; Mathison Centre for Mental Health Research & Education, Hotchkiss Brain Institute, Canada. Electronic address: patten@ucalgary.ca.
2
Department of Community Health Sciences, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, Canada T2N 4Z6.
3
Oxford University, Oxford, UK.
4
Department of Community Health Sciences, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, Canada T2N 4Z6; Department of Psychiatry, University of Calgary, Canada; Mathison Centre for Mental Health Research & Education, Hotchkiss Brain Institute, Canada.
5
Department of Community Health Sciences, University of Calgary, 3280 Hospital Drive NW, Calgary, AB, Canada T2N 4Z6; Department of Clinical Neurosciences, University of Calgary, Canada; O'Brien Institute for Public Health, Canada.

Abstract

BACKGROUND:

Epidemiological studies have consistently linked smoking to poor mental health. Among non-smokers, some studies have also reported associations between secondhand smoke exposure and psychological symptoms. However, an association between secondhand smoke exposure and depressive disorders has not been well established.

METHODS:

This analysis used cross-sectional data from a series of 10 population surveys conducted in Canada between 2003 and 2013. The surveys targeted the Canadian household population, included a brief structured interview for past year major depressive episode (MDE) and included items assessing secondhand smoke exposure. We used two-stage individual-level random-effects meta-regression to synthesize results from these surveys.

RESULTS:

Over the study interval, about 20% of non-smokers reported substantial exposure to secondhand smoke. In this group, the pooled annual prevalence of MDE was 6.1% (95% CI 5.3-6.9) compared to 4.0% (95% CI 3.7-4.3) in non-smokers without secondhand smoke exposure. The crude odds ratio was 1.5 (95% CI 1.4-1.7). With adjustment for a set of potential confounding variables the odds ratio was unchanged, 1.4 (95% CI 1.2 - 1.6).

CONCLUSIONS:

These results provide additional support for public health measures aimed at reducing secondhand smoke exposure. A causal connection between secondhand smoke exposure and MDEs cannot be confirmed due to the cross-sectional nature of the data. Longitudinal studies are needed to establish temporal sequencing.

PMID:
28841490
DOI:
10.1016/j.jad.2017.08.006
[Indexed for MEDLINE]

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