Fig. 2
From: Daily step count and all-cause mortality in a sample of Japanese elderly people: a cohort study
Restricted cubic spline regression for the association between steps/day levels and all-cause mortality. Data were fitted using a Cox proportional hazards model after adjusting 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). The solid line represents hazard ratios and the dashed line represents 95% confidence intervals. Knots were placed at the 10th, 50th, and 90th percentiles (3274, 6111, 10,224 steps/day) of daily step levels and using 1160 steps/day as a reference point