Skip to main content

Table 2 Risk estimates of high green tea consumption with esophageal cancer by sex, geographic region and type of epidemiologic studies

From: Green tea consumption and risk of esophageal cancer: a meta-analysis of epidemiologic studies

  No. of studies No. of cases RR or OR (95% CI)    Heterogeneity    Publication bias
     p I2 Begg’s test Egger’s test
Overall 10 3557 0.76(0.49-1.02) 0.00 0.73 0.37 0.16
Country        
Japan 2 78 1.67(0.46-2.87) 0.90 0.00 1.00 NA
China 7 3213 0.73(0.44-1.02) 0.00 0.79 0.12 0.05
Northern Iran 1 266 0.65 (0.32-1.31) NA NA NA NA
Study design        
Cohort studies 2 78 1.67(0.46-2.87) 0.90 0.00 1.00 NA
Case control 8 3479 0.72(0.45-0.98) 0.00 0.76 0.07 0.02
Participates source        
PCC 7 3329 0.71 (0.43-0.98) 0.00 0.78 0.05 0.02
HCC 1 150 0.92 (0.49-2.32) NA NA NA NA
Gender        
Male 2 845 1.04(0.48-1.60) 0.05 0.73 1.00 NA
Female 2 412 0.32(0.10-0.54) 0.75 0.00 1.00 NA
  1. NA; not applicable; PCC: population based case control; HCC: hospital based case control.