Table 2

Subgroup analysis of cruciferous vegetables consumption and the risk of ovarian cancer
No. of studies Pooled estimate Tests of heterogeneity
RR 95% CI P value I2 (%)
All studies 11 0.90 0.82- 0.98 0.204 25.2
Study design
Cohort 5 1.00 0.85-1.11 0.897 0.0
Case–control 6 0.84 0.75-0.94 0.091 47.4
Study location
Europe 4 0.88 0.79-0.99 0.656 0.0
North America 4 0.88 0.77-1.02 0.043 63.2
Asia 2 0.84 0.53-1.34 0.217 34.5
Australia 1 1.16 0.81-1.67 / /
Data source
Hospital-based 4 0.82 0.72-0.94 0.119 48.8
Population-based 7 0.95 0.85-1.07 0.577 0.0

The data in bold demonstrate significant results.

Han et al.

Han et al. Diagnostic Pathology 2014 9:7   doi:10.1186/1746-1596-9-7

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