Table 2

Odds ratios of bladder cancer in male coffee and non-coffee drinkers by cigarette consumption (compared with non-smokers)

Variable		Coffee drinkers			Variable		Non-coffee drinkers
Variable		Cases	Controls		Variable		OR	95% CI	Cases	Controls	OR	95% CI
Tobacco			Tobacco
Non-smoker	24	123	1	Reference	Non-smoker	3	41	1	Reference
Smoker	337	655	2.71	1.71, 4.31	Smoker	30	57	7.31	2.05, 26.11

Non-smoker	24	123	1	Reference	Non-smoker	3	41	1	Reference
Ex-smoker	69	192	1.96	1.16, 3.31	Ex-smoker	6	28	3.08	0.68, 13.98
Current smoker	268	463	3.03	1.89, 4.84	Current smoker	24	29	11.72	3.06, 44.87
Cigarettes/day			Cigarettes/day
among smokers in general			among smokers in general
0	24	123	1	Reference	0	3	41	1	Reference
1–10	33	180	1.46	0.85, 2.53	1–10	3	27	1.33	0.24, 7.32
11–20	206	323	3.40	2.11, 5.48	11–20	20	19	20.09	4.85, 83.18
21–30	58	111	2.80	1.62, 4.85	>20	7	9	10.57	2.07, 54.09
⩾31	22	38	2.87	1.44, 5.75
Cigarettes/day			Cigarettes/day
among current smokers			among current smokers
0	24	123	1	Reference	0	3	41	1	Reference
1–10	33	100	1.75	0.96, 3.17	1–10	3	11	2.89	0.47, 17.69
11–20	173	246	3.81	2.33, 6.22	11–20	16	11	34.76	6.70, 180.26
21–30	46	86	2.97	1.67, 5.31	>20	5	6	10.37	1.65, 65.09
⩾31	15	28	2.84	1.31, 6.19
Years of smoking			Years of smoking
0	24	123	1	Reference	0	3	41	1	Reference
1–19	23	60	1.85	0.96, 3.57	1–30	3	10	3.44	0.57, 20.60
20–39	109	235	2.23	1.34, 3.69	>30	27	47	8.38	2.30, 30.55
40–59	192	333	3.30	2.30, 5.37
⩾60	13	27	3.09	1.36, 7.05
Cigarettes/lifetime			Cigarettes/lifetime
0	24	123	1	Reference	0	3	41	1	Reference
<150.000	61	199	1.60	0.94, 2.71	<150.000	5	25	2.09	0.44, 10.02
150–299.999	149	262	3.03	1.85, 4.94	150–299.999	17	18	18.60	4.36, 79.40
⩾300.000	125	191	3.62	2.19, 5.98	⩾300.000	8	12	11.87	2.35, 59.89