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Table 3 Risk estimates of medium 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 0.86(0.70-1.03) 0.00 0.56 0.24 0.22
Country        
Japan 2 78 1.14(0.46-2.87) 0.90 0.00 0.26 0.17
China 7 3213 0.86 (0.67-1.05) 0.00 0.67 0.04 0.03
Northern Iran 1 266 0.65 (0.32-1.31) NA NA NA NA
Study design        
Cohort studies 2 78 1.14(0.46-2.87) 0.90 0.00 0.26 0.17
Case control 8 3479 0.85(0.67-1.02) 0.00 0.65 0.03 0.02
Participates source        
PCC 7 3329 0.82(0.63-1.01) 0.00 0.69 0.03 0.01
HCC 1 150 1.13(0.69-1.57) 0.77 0.00 0.30 0.01
Gender        
Male 2 845 1.04(0.49-1.59) 0.05 0.74 1.00 NA
Female 2 412 0.43(0.21-0.66) 0.35 0.00 1.00 NA
  1. NA; not applicable; PCC: population based case control; HCC: hospital based case control.