Reducing depressive symptoms after the Great East Japan Earthquake in older survivors through group exercise participation and regular walking: a prospective observational study.

We used STATA 13/SE (StataCorp, College Station, Texas, USA) for all statistical analyses and multiple imputations with the statistical significance set at p<0.05 and the marginal significance set at p<0.10.

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Interactions between housing damage and changes in group exercise participation ( B =0.103, β =0.034, p=0.063) and changes in walking habit ( B =0.095, β =0.033, p=0.070) were marginally significant, meaning that the protective effects tended to be attenuated among survivors reporting more extensive housing damage.

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Large coefficients were generally observed in older adults with depressive symptoms compared with those without depressive symptoms at baseline, although these associations did not reach statistical significance after adjustment of covariates because of limited statistical power. supplementary table bmjopen-2016-013706supp_table2.pdf Supplementary table bmjopen-2016-013706supp_table3.pdf Discussion To the best of our knowledge, this is the first study to explore the potential benefits of group exercise participation and regular walking on depressive symptoms following exposure to natural disaster in which information on mental health status was available predating the event.

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