Table 3.

Age- and multivariate-adjusted hazard ratios for bladder cancer according to obesity: stratified by smoking status.

BMI, kg/m2	Nonsmokers			P for trend	Ex-smokers			P for trend	Current smokers			P for trend
	Event	Incidence*	H.R (95% confidence interval)†		Event	Incidence*	H.R (95% confidence interval)†		Event	Incidence*	H.R (95% confidence interval)†
<18.5	247	6.86	0.86 (0.76, 0.98)	<0.01	135	24.11	0.93 (0.78, 1.10)	<0.01	314	30.00	0.97 (0.86, 1.09)	<0.01
18.5–22.9	3,043	9.16	Ref.		1,756	33.35	Ref.		2,682	23.26	Ref.
23.0–24.9	2,464	13.46	1.08 (1.03, 1.14)		1,634	33.69	1.07 (1.01, 1.15)		1,865	24.40	1.14 (1.08, 1.21)
25.0–29.9	3,015	14.87	1.12 (1.06, 1.77)		2,168	34.80	1.21 (1.33, 1.29)		1,961	20.80	1.17 (1.10, 1.24)
≥30	308	11.27	1.16 (1.03, 1.31)		152	26.19	1.24 (1.16, 1.31)		162	12.80	1.22 (1.04, 1.43)

*All rates are expressed as number per 100,000 person-years.

^†Adjusted for age, sex, regular exercise, and alcohol consumption.