Table 3 omparison of findings of the present dose–response meta-analysis with those reported in previous meta-analysis
Reference | Tea type | Previous review* | Present review# | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
Cohort study | Case–control study | Over all | ||||||||
N | Pooled RR (95%CI) | N | Pooled OR (95%CI) | N | Pooled RR (95%CI) | Tea type | N | Pooled RR (95%CI) | ||
Breast cancer | ||||||||||
Ogunleye et al. 2010 | Green tea | 2 | 0.85 (0.65-1.12) | 5 | 0.81 (0.75-0.88) | 7 | 0.81 (0.75-0.88) | Tea | 15 | 1.02 (0.98-1.06) |
Sun et al. 2006 | Green tea | 3 | 0.85 (0.66-1.09) | 1 | 0.47 (0.26-0.85) | 4 | 0.78 (0.61-0.98) | Green tea | 4 | 0.97 (0.90-1.06) |
Sun et al. 2006 | Black tea | 5 | 1.15 (1.02-1.31) | 8 | 0.91 (0.84-0.98) | 13 | 0.98 (0.88-1.09) | Black tea | 4 | 1.18 (1.05-1.32) |
Seely et al. 2005 | Green tea | 3 | 0.89 (0.71-1.10) | 2 | 0.44 (0.14-1.31) | - | - | |||
Colorectal cancer | ||||||||||
Wang et al. 2012 | Green tea | - | - | 13 | 0.95 (0.81-1.11) | - | - | Tea | 15 | 0.98 (0.93-1.03) |
Sun et al. 2006 | Green tea | 4 | 0.97 (0.82-1.16) | 4 | 0.74 (0.63-0.86) | 8 | 0.82 (0.69-0.98) | Green tea | 5 | 1.00 (0.94-1.07) |
Sun et al. 2006 | Black tea | 7 | 1.02 (0.78-1.34) | 13 | 0.98 (0.84-1.15) | 20 | 0.99 (0.87-1.13) | Black tea | 2 | 0.99 (0.86-1.14) |
Zhang et al. 2010 | Tea | 13 | 1.28 (1.02-1.61) | - | - | 13 | 1.28 (1.02-1.61) | |||
Liver cancer | ||||||||||
Sing et al. 2011 | Tea | 7 | 0.84 (0.69-1.02) | 6 | 0.86 (0.44-1.14) | 11 | 0.77 (0.57-1.03) | Tea Green tea | 4 | 0.93 (0.75-1.17) |
3 | 0.93 (0.75-1.17) | |||||||||
Prostate cancer | ||||||||||
Zheng et al. 2011 | Green tea | 4 | 1.00 (0.66-1.53) | 3 | 0.43 (0.25-0.73) | 7 | 0.72 (0.45-1.15) | Tea | 7 | 1.00 (0.87-1.15) |
Zheng et al. 2011 | Black tea | Prospective: 3 | 0.83 (0.63-1.08) | 6 | 1.07 (0.78-1.48) | 11 | 0.99 (0.82-1.20) | Green tea | 4 | 0.99 (0.88-1.11) |
Retrospective: 2 | 1.04 (0.73-1.50) | Black tea | 3 | 0.99 (0.90-1.09) | ||||||
Stomach cancer | ||||||||||
Kang et al. 2010 | Green tea | 7 | 1.03 (0.92-1.16) | 11 | 0.74 (0.63-0.86) | 18 | 0.86 (0.74-1.00) | Tea | 5 | 0.97 (0.92-1.02) |
Myung et al. 2009 | Green tea | 7 | 1.04 (0.93-1.17) | 8 | 0.73 (0.64-0.83) | 15 | 0.82 (0.70-0.96) | Green tea | 4 | 0.99 (0.94-1.05) |
Zhou et al. 2008 | Green tea | 4 | 1.56 (0.93-2.60) | HCC:4 | 1.12 (0.70-1.77) | 14 | 0.98 (0.77-1.24) | Black tea | 1 | 0.94 (0.72-1.22) |
PCC:6 | 0.67 (0.49-0.92) | |||||||||