Table 3.

Crude and adjusted hazard ratios for all-cause mortality by 10-unit increase in SF-12 mental component scores (MCS) according to country of recruitment

	Total (N = 19,106)			Country (N = 19,106)						p-value for interactionc
				Australia (N = 16,696)			U.S. (N = 2410)
	N	No. of deaths	Hazard ratiob (95% CI)	N	No. of deaths	Hazard ratiob (95% CI)	N	No. of deaths	Hazard ratiob (95% CI)
All-cause mortalitya
MCS	19,106	1052	0.94 (0.86–1.02)	16,696	912	0.98 (0.89–1.07)	2410	140	0.77 (0.64–0.93)	0.03
MCS adjustedd	19,105	1052	0.91 (0.84–0.99)	16,695	912	0.95 (0.87–1.04)	2410	140	0.76 (0.63–0.92)	0.03
MCS adjustede	18,901	1037	0.95 (0.87–1.03)	16,521	898	0.98 (0.90–1.08)	2380	139	0.78 (0.63–0.95)	0.06

MCS mental component score, U.S. United States of America

^aAll-cause mortality censored at June 12, 2017, providing 88,345.0 person-years of observation (the average length of observation was 4.6 ± SD1.3 years, the median length of observation was 4.7 years, with participants ranging between 0 and 7.3 years of observation)

^bFor every 10-unit increase in MCS

^cp-value for interaction between MCS and country

^dAdjusted for age at randomization, gender, education, and living situation

^eAdjusted for age at randomization, gender, education, living situation, smoking, alcohol, average longest amount of time walking outside home without any rest (last 2 weeks), cancer history, hypertension, diabetes, body mass index, and modified mini-mental state examination score