Table 2 Stratified analysis of tea consumption and prostate cancer risk
From: Tea consumption and prostate cancer: an updated meta-analysis
Studies (n) | OR (95% CI) | Test for heterogeneity | Test for publish bias | |||
|---|---|---|---|---|---|---|
P heterogeneity | I2(%) | P egger’s | P begg’s | |||
All studies | 28 | 0.86 (0.69-1.04) | <0.001 | 86.1 | 0.066 | 0.020 |
Region | ||||||
Asian | 16 | 0.81 (0.55-1.08) | <0.001 | 86.3 | 0.071 | 0.027 |
Non-Asian | 12 | 0.89 (0.72-1.07) | 0.001 | 65.7 | 0.578 | 0.407 |
Tea type | ||||||
Green tea | 9 | 0.79 (0.43-1.14) | <0.001 | 90.0 | 0.041 | 0.048 |
Black tea | 18 | 0.88 (0.73-1.02) | 0.002 | 56.6 | 0.499 | 0.272 |
Green tea in Asian | 8 | 0.82 (0.42-1.21) | <0.001 | 91.0 | 0.068 | 0.063 |
Black tea in non-Asian | 11 | 0.92 (0.73-1.11) | 0.001 | 67.4 | 0.784 | 0.696 |
Study design | ||||||
Cohort studies | 9 | 0.98 (0.86-1.09) | 0.303 | 15.7 | 0.630 | 0.602 |
Case–control studies | 19 | 0.77 (0.55-0.98) | <0.001 | 84.7 | 0.071 | 0.050 |