Table 5

Incidence RR of urothelial cancer for vegetable and fruits consumption, according to cigarette smoking amount and cigarette smoking status categories; NLCS (1986–1992)

Smoking status and amount	No. of cases	Vegetable and fruit consumption (grams/day in tertiles)
Smoking status and amount	No. of cases			1 (low)	2	3 (high)	P^a
Vegetable consumption
Never^b	59	1.00 (reference)	0.72 (0.37–1.39)	0.83 (0.43–1.59)	0.54
Ex
<15 cig/day^c	83	1.00 (reference)	1.16 (0.66–2.02)	0.90 (0.47–1.70)	0.78
≥15 cig/day^c	151	1.00 (reference)	0.89 (0.55–1.44)	0.92 (0.57–1.48)	0.73
Current
<15 cig/day^c	73	1.00 (reference)	0.58 (0.29–1.16)	1.03 (0.53–2.00)	1.00
≥15 cig/day^c	142	1.00 (reference)	0.97 (0.60–1.57)	0.78 (0.47–1.28)	0.34
Fruit consumption
Never^b	62	1.00 (reference)	1.08 (0.54–2.14)	0.98 (0.51–1.90)	0.93
Ex
<15 cig/day^c	85	1.00 (reference)	0.76 (0.40–1.43)	1.57 (0.89–2.77)	0.10
≥15 cig/day^c	160	1.00 (reference)	0.77 (0.49–1.19)	0.68 (0.42–1.11)	0.11
Current
<15 cig/day^c	80	1.00 (reference)	0.75 (0.41–1.35)	0.50 (0.23–1.10)	0.08
≥15 cig/day^c	150	1.00 (reference)	0.82 (0.51–1.33)	0.60 (0.35–1.03)	0.06

^a P trend.
^b Adjusted for age (years) and sex.
^c Adjusted for age (years), sex, and years of cigarette smoking.