Table 6 Subgroup analysis for studies included in the analysis
Variable | No. of studies | Pooled RR (95% CI) | I2 statistics (%) | P value for the heterogeneity Q test |
|---|---|---|---|---|
Region | ||||
Europe | 3 | 1.24(1.03, 1.51) | 45.70% | 0.158 |
Asia | 4 | 1.32(1.24, 1.41) | 39.40% | 0.176 |
Study design | ||||
Case–control | 4 | 1.40(1.17, 1.69) | 0.70% | 0.389 |
Cohort | 3 | 1.25(0.89, 1.77) | 0.00% | 0.618 |
BMI | 2.58(1.21, 5.54) | 0.00% | 0.472 | |
low | 3 | 1.54(1.16, 2.06) | 0.00% | 0.958 |
high | 2 | 1.30(1.02, 1.66) | 66.60% | 0.052 |
Gallstones | 3 | 1.18(0.55, 2.48) | 73.10% | 0.024 |
Cholecystectomy | 2 | 1.27(0.74, 2.19) | 0.00% | 0.936 |