Table 1.

Distribution of controls and cases by sociodemographic variables and selected risk factors

		Cases		Controls		OR	95% CI
Variable	Category	Number	%	Number	%
Age (years)	30–39	2	0.8	4	0.8	NA
	40–49	14	5.5	28	5.6
	50–59	37	14.5	74	14.8
	60–69	91	35.7	182	36.3
	70–79	86	33.7	175	34.9
	80–89	25	9.8	38	7.6
Sex	Males	225	88.2	441	88.0	NA
	Females	30	11.8	60	12.0
Residence	Montevideo	116	45.5	254	50.7	NA
	Other counties	139	54.5	247	49.3
Urban/rural status	Urban	192	75.3	416	83.0	1.00
	Rural	63	24.7	85	17.0	1.31	0.80–2.14
Education (years)	0–2	57	22.3	140	27.9	1.00
	3–5	106	41.6	175	34.9	1.42	0.93–2.17
	6+	92	36.1	186	37.2	1.24	0.79–1.95
Income (US dollars per month)	<=142	93	36.5	225	44.9	1.00
	143+	113	44.3	194	38.7	1.51	1.05–2.17
	Missing	49	19.2	82	16.4	1.50	0.94–2.40
Family history of bladder cancer	No	244	95.7	495	98.8	1.00
	Yes	11	4.3	6	1.2	4.97	1.73–14.27
Body Mass Index	<=22.8	59	23.1	127	25.3	1.00
	22.9–25.1	65	25.5	126	25.1	1.13	0.72–1.79
	25.2–27.1	53	20.8	120	23.9	0.92	0.57–1.49
	27.2+	78	30.6	128	25.7	1.33	0.84–2.10
Occupation	Low risk	175	68.6	385	76.9	1.00
	High risk	80	31.4	116	23.1	1.41	0.92–2.15
Years of smoking	Never smokers	48	18.8	136	27.1	1.0	Reference
	1–29	32	12.5	60	12.0	1.55	0.85–2.82
	30–39	31	12.2	70	14.0	1.34	0.73–2.46
	40–49	54	21.2	109	21.8	1.61	0.94–2.74
	50+	90	35.3	126	25.1	2.39	1.46–3.90
N patients		255	100.0	501	100.0

NA, not applicable (matching variable)

OR, odds ratio adjusted for age, sex, residence, urban/rural status, education, family history of bladder cancer among first-degree relatives, body mass index, occupation, smoking status, years since quit, number of cigarettes smoked per day, maté drinking, coffee drinking, tea drinking, soft drinks and milk intake

CI, confidence interval