Quasi-experimental evidence on the causal effects of physical health on mental health

International Journal of Epidemiology
Manoj Mohanan, Joanna Maselko

Abstract

While a large body of literature has demonstrated an association between physical health problems and psychiatric ones, the extent to which one is causally linked to the other remains difficult to estimate. This quasi-experimental study seeks to (i) estimate causal effects of an acute negative health event (health shock) on mental health and (ii) examine the role of debt and disability as potential mediators. The study design employs exogenous injuries in bus accidents together with a matching procedure to simulate a random exposure to physical health shock. The study was conducted among travellers on state-owned buses in Karnataka, India. Exposure occurred between July and December 2005. Outcomes were assessed from a household survey conducted in November-December 2006. Eighty-four injured passengers identified from bus accident compensation records were interviewed along with 336 unexposed individuals enrolled from passengers on the same accident bus routes, matched on age group, gender and village/neighbourhood of residence. The main outcome of Psychological Distress was measured using the Kessler-10 scale. Exposure to the health shock increases psychological distress by 1.5 standard deviations (SD) 1 year later (P < 0.01). ...Continue Reading

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Citations

Jul 16, 2013·Social Science & Medicine·Edward N Okeke, Glenn J Wagner

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