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Table 4 Risk estimates of low 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 0.83(0.58-1.08) 0.00 0.66 0.12 0.03
Country        
Japan 2 78 0.96(0.01-1.92) 0.59 0.00 1.00 NA
China 7 3213 0.85(0.56-1.13) 0.00 0.75 0.18 0.03
Northern Iran 1 266 0.65 (0.32-1.31) NA NA NA NA
Study design        
Cohort studies 2 78 0.96 (0.01-1.92) 0.59 0.00 1.00 NA
Case control 8 3479 0.82 (0.56-1.09) 0.00 0.72 0.07 0.01
Participates source        
PCC 7 3329 0.78(0.51-1.05) 0.00 0.73 0.03 0.01
HCC 1 150 1.27(0.72-1.89) NA NA NA NA
Gender        
Male 2 845 1.04(0.48-1.61) 0.06 0.72 1.00 NA
Female 2 412 0.45(0.10-0.79) 0.16 0.49 1.00 NA
  1. NA; not applicable; PCC: population based case control; HCC: hospital based case control.