TABLE 3.

Association Between Self-Reported Duration of Physical Activity at Different Intensity Levels and Mortality: Whitehall II Study, London, UK, 1997-2009

Intensity of Physical Activity	Person-Years	No. of Deaths	Rate/1000 Person-Yearsa	Model 1, HR (95% CI)	Model 2, HR (95% CI)	Model 3, HR (95% CI)	Model 4, HR (95% CI)
Mild activities
< 5.5 h/wk	23 603	120	5.25	1	1	1	1
5.5–8.9 h/wk	24 218	93	3.96	0.75* (0.57, 0.98)	0.79 (0.60, 1.04)	0.78 (0.59, 1.02)	0.85 (0.64, 1.12)
≥ 9.0 h/wk	23 787	104	4.14	0.78 (0.60, 1.02)	0.83 (0.64, 1.09)	0.82 (0.63, 1.08)	0.93 (0.71, 1.23)
P for trend				.07	.219	.17	.64
Moderate activities
< 1.0 h/wk	22 999	139	6.67	1	1	1	1
1.0–3.4 h/wk	23 881	88	3.79	0.57* (0.43, 0.74)	0.61* (0.46, 0.79)	0.61* (0.46, 0.80)	0.67* (0.51, 0.88)
≥ 3.5 h/wk	24 728	90	3.29	0.48* (0.37, 0.63)	0.54* (0.41, 0.72)	0.55* (0.41, 0.73)	0.67* (0.50, 0.91)
P for trend				< .001	< .001	< .001	.006
Vigorous activities
None	37 697	202	5.38	1	1	1	1
0.1–0.9 h/wk	20 883	72	3.48	0.65* (0.50, 0.86)	0.73* (0.55, 0.96)	0.72* (0.55, 0.95)	0.82 (0.62, 1.08)
≥ 1.0 h/wk	13 028	43	3.21	0.62* (0.45, 0.86)	0.74 (0.52, 1.03)	0.74 (0.53, 1.05)	0.90 (0.64, 1.28)
P for trend				< .001	.02	.02	.32

Note. CI = confidence interval; HR = hazard ratio. Model 1 was adjusted for age. Model 2 was adjusted for the variables in model 1 and mutually adjusted for all physical activity intensity levels. Model 3 was adjusted for the variables in model 2 plus sociodemographic variables (gender, socioeconomic status, and marital status). Model 4 was adjusted for model 3 plus other health behaviors (smoking, alcohol consumption, and fruit and vegetable consumption) and health (diabetes, coronary heart disease, stroke, and self-rated health).

^aRate was adjusted for age.

*P < .05.