Table 2.

Cox proportional regression models predicting all-cause mortality from baseline physical activity and lower limb function

Variables	Number of deaths	Person years	Model 1 HR (95% CIs)	Model 2 HR (95% CIs)	Model 3a HR (95% CIs)
Total steps per day (n = 201)			P = 0.001	P = 0.054	P = 0.169
Low	18	252.18	11.38 (2.64–49.04)	7.69 (1.43–41.20)	5.46 (0.91–32.76)
Medium	8	298.20	4.26 (0.91–20.07)	3.99 (0.80–20.01)	3.90 (0.77–19.70)
High (ref.)	2	321.14	1.00	1.00	1.00
Minutes of MVPA per day (n = 208)			P = 0.002	P = 0.070	P = 0.692
Low	22	308.80	5.56 (1.30–23.72)	3.67 (0.70–19.15)	1.84 (0.32–10.75)
Medium	8	414.40	1.59 (0.34–7.49)	1.25 (0.25–6.41)	1.19 (0.23–6.24)
High (ref.)	2	171.18	1.00	1.00	1.00
Minutes of sedentary time per day (n = 208)			P = 0.317	P = 0.888	P < 1.000
Low	7	272.05	0.51 (0.21–1.26)	0.81 (0.29–2.24)	1.01 (0.35–2.98)
Medium	10	307.80	0.69 (0.31–1.54)	1.04 (0.42–2.55)	0.99 (0.39–2.58)
High (ref.)	15	309.91	1.00	1.00	1.00
Frequency of trips per week (n = 200)			P = 0.237	P = 0.808	P = 0.461
Low	18	383.50	1.57 (0.66–3.76)	0.98 (0.36–2.65)	0.51 (0.17–1.55)
Medium	5	246.19	0.71 (0.22–2.23)	0.71 (0.21–2.37)	0.52 (0.14–1.93)
High (ref.)	7	238.77	1.00	1.00	1.00
Lower limb function score (n = 213)			P < 0.001	P = 0.006	P = 0.507
Low	11	98.06	5.68 (2.50–12.89)	5.30 (1.91–14.72)	2.05 (0.56–7.51)
Medium	10	191.69	2.79 (1.21–6.47)	2.58 (0.89–7.52)	1.69 (0.49–5.83)
High (ref.)	12	623.76	1.00	1.00	1.00

HR, hazards ratio with confidence intervals (CIs).

Model 1: unadjusted; Model 2: adjusting for age, gender, educational attainment, IMD, weight status, GP Management System and number of self-reported chronic illnesses at baseline; Model 3: additionally adjusting for lower limb function.

^aIn Model 3 for lower limb function additionally adjusting for STEPS.