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Table 2 Subgroup analysis of cancer risk for an increment of three cup tea consumption by gender, tea type and geographic region

From: Tea consumption and the risk of five major cancers: a dose–response meta-analysis of prospective studies

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)