Table 2 Subgroup analysis of cancer risk for an increment of three cup tea consumption by gender, tea type and geographic region
Subgroup | Breast | Stomach | Liver | Prostate | ||||
|---|---|---|---|---|---|---|---|---|
N | Pooled RR (95%CI) | N | Pooled RR (95%CI) | N | Pooled RR (95%CI) | N | Pooled RR (95%CI) | |
By gender | ||||||||
Male | - | - | 2 | 1.20 (0.72-2.01) | - | - | 6 | 1.02 (0.96-1.09) |
Female | 15 | 1.02 (0.98-1.05) | 3 | 0.88 (0.80-0.98) | 1 | 0.65 (1.30-1.43) | - | - |
By menopausal status | ||||||||
Pre-menopausal | 2 | 0.96 (0.79-1.18) | - | - | - | |||
Post-menopausal | 3 | 1.12 (0.96-1.30) | - | - | - | |||
By tea type | ||||||||
Green tea | 4 | 0.97 (0.90-1.06) | 4 | 0.99 (0.94-1.05) | 3 | 0.93 (0.75-1.17) | 4 | 0.99 (0.88-1.11) |
Black tea | 4 | 1.18 (1.05-1.32) | 1 | 0.94 (0.72-1.22) | - | - | 3 | 0.99 (0.90-1.09) |
By geographic region | ||||||||
Europe | 6 | 1.05 (0.96-1.15) | 1 | 0.94 (0.72-1.22) | - | - | 2 | 1.07 (0.90-1.27) |
Asian | 4 | 0.98 (0.90-1.06) | 4 | 0.99 (0.87-1.12) | 4 | 0.91 (0.74-1.12) | 4 | 1.00 (0.90-1.12) |
China | 1 | 1.25 (0.71-2.19) | 1 | 0.73 (0.45-1.17) | 1 | 0.65 (0.30-1.43) | - | - |
Japan | 3 | 0.97 (0.89-1.05) | 3 | 1.01 (0.86-1.14) | 3 | 0.90 (0.80-1.01) | 3 | 0.99 (0.88-1.11) |
North America | 5 | 1.00 (0.94-1.07) | - | - | - | - | 1 | 0.96 (0.79-1.17) |
Subgroup | Colon | Rectal | Colorectal | |||||
N | Pooled RR (95% CI) | N | Pooled RR (95% CI) | N | Pooled RR (95% CI) | |||
By gender | ||||||||
Male | 6 | 1.00 (0.90-1.11) | 5 | 0.96 (0.83-1.11) | 6 | 0.98 (0.90-1.07) | ||
Female | 6 | 1.02 (0.92-1.14) | 2 | 0.93 (0.78-1.10) | 6 | 0.99 (0.90-1.09) | ||
By tea type | ||||||||
Green tea | 4 | 1.01 (0.93-1.09) | 3 | 1.00 (0.90-1.12) | 5 | 1.00 (0.94-1.07) | ||
Black tea | 1 | 0.86 (0.45-1.66) | 1 | 1.76 (0.77-4.02) | 2 | 0.99 (0.86-1.14) | ||
By geographic region | ||||||||
Europe | 3 | 1.02 (0.84-1.24) | 3 | 0.92 (0.77-1.10) | 4 | 0.96 (0.88-1.04) | ||
Asian | 5 | 1.00 (0.93-1.08) | 4 | 0.99 (0.89-1.10) | 6 | 0.99 (0.93-1.06) | ||
China | 1 | 0.88 (0.58-1.33) | 1 | 0.78 (0.47-1.30) | 2 | 0.83 (0.64-1.06) | ||
Japan | 4 | 1.01 (0.93-1.09) | 3 | 1.00 (0.90-1.12) | 4 | 1.01 (0.94-1.07) | ||
North America | 4 | 1.04 (0.90-1.20) | 3 | 0.81 (0.60-1.09) | 5 | 0.97 (0.85-1.09) | ||