TABLE 2.

Subgroup analyses for the relationship between consumption of cruciferous vegetables and the risk of bladder cancer.

Factors stratified	No. of cohorts	RR (95% CI)	Q	P	I2, %
All cohorts	8	0.92 (0.80–1.06)	20.40	0.005	65.7
Region
Europe	2	1.04 (0.84–1.28)	0.62	0.432	0.0
United States	5	0.83 (0.63–1.11)	17.61	0.001	77.3
Publication year
≥2010	4	0.94 (0.81–1.10)	8.67	0.034	65.4
<2010	4	0.90 (0.65–1.25)	11.17	0.011	73.2
Gender
Male	4	0.84 (0.64–1.09)	10.47	0.015	71.3
Female	3	0.91 (0.76–1.08)	2.08	0.353	3.8
Participants, n
≥100,000	3	0.97 (0.82–1.14)	6.66	0.036	70.0
<100,000	5	0.88 (0.68–1.14)	11.84	0.019	66.2
Cases, n
≥1,000	2	1.00 (0.86–1.18)	4.53	0.033	77.9
<1,000	6	0.86 (0.68–1.08)	12.76	0.026	60.8

No., number; RR, relative risk; CI, confidence interval.