Daily step count and all-cause mortality in a sample of Japanese elderly people: a cohort study

BMC Public Health

Table 4 Adjusted hazard ratios for all-cause mortality according to steps/day levels (quartiles)

	First quartile	Second quartile	Third quartile	Fourth quartile	P for trend
All participants
Number of participants	105	104	105	105
Person-years of follow-up	1019	1007	983	1099
Number of decedents	22	18	25	11
Death rate per 10,000 person-years	216	179	254	100
Sex adjusted HR (95%CI)	1.00 (reference)	0.84 (0.45–1.56)	1.23 (0.69–2.19)	0.42 (0.20–0.87)	0.080
Multivariable adjusted HR^a(95%CI)	1.00 (reference)	0.81 (0.43–1.54)	1.26 (0.70–2.26)	0.46 (0.22–0.96)	0.149
Male
Number of participants	57	56	52	63
Person-years of follow-up	526	514	476	666
Number of decedents	17	16	19	8
Death rate per 10,000 person-years	323	311	399	120
Crude HR (95%CI)	1.00 (reference)	0.97 (0.49–1.92)	1.25 (0.65–2.40)	0.37 (0.16–0.86)	0.056
Multivariable adjusted HR^b (95%CI)	1.00 (reference)	1.00 (0.49–2.01)	1.34 (0.68–2.62)	0.44 (0.19–1.03)	0.165
Female
Number of participants	48	48	53	42
Person-years of follow-up	493	493	507	433
Number of decedents	5	2	6	3
Death rate per 10,000 person-years	101	41	118	69
Crude HR (95%CI)	1.00 (reference)	0.40 (0.08–2.07)	1.17 (0.36–3.84)	0.68 (0.16–2.86)	0.945
Multivariable adjusted HR^b (95%CI)	1.00 (reference)	0.36 (0.07–1.93)	1.14 (0.35–3.76)	0.66 (0.15–3.01)	0.985

HR hazard ratio, CI confidence interval
^a Adjusted for sex, body mass index (continuous variable), cigarette smoking (never-smokers, past smokers, current smokers), alcohol intake (non, 1–2 times/week, 3–5 times/week, 6–7 times/week), and medication use (yes, no)
^b Adjusted for body mass index (continuous variable), cigarette smoking (never-smokers, past smokers, current smokers), alcohol intake (non, 1–2 times/week, 3–5 times/week, 6–7 times/week), and medication use (yes, no)

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