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Table 3 omparison of findings of the present doseresponse meta-analysis with those reported in previous meta-analysis

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

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)      
  1. HCC: Hospital based case–control PCC: population based case–control N: number of studies included.
  2. *Pooled results between highest consumption level and non/lowest drinker.
  3. #Pooled results with an increase in tea consumption.