Table 2.

Association between period of residence in prefabricated temporary housing and psychological distress during 4.3 years after the Great East Japan Earthquake (n=284)

	Period of residence in prefabricated temporary housing (years)			P trend
	<3 years	3–4 years	> 4years (still living in prefabricated temporary housing)
Number of subjects	146	101	37
Number of subjects with higher psychological distress*	61	45	27
Crude OR (95% CI)	1.00 (reference)	1.12 (0.67 to 1.87)	3.64 (1.71 to 8.28)	0.005
Age–sex adjusted OR (95% CI)	1.00 (reference)	1.12 (0.66 to 1.88)	4.22 (1.92 to 9.87)	0.003
Multivariate adjusted OR (95% CI)†	1.00 (reference)	1.12 (0.63 to 2.01)	4.00 (1.67 to 10.16)	0.010

*Higher psychological distress was defined as K6 score≥5 at the follow-up survey (2016).

†Adjustment items were age, sex, K6 score at baseline, subjective economic status (poorest, fair to poorer or missing), social ties (strong ties, weak ties or missing) and self-rated health (good health, bad health or missing).

K6, Kessler 6-Item Psychological Distress Scale.