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| Factors | Number of participating patients | Number of literatures |
Statistical method | I2C with P value | Effect estimate | P value |
|---|---|---|---|---|---|---|
| CEA | 242 | 2 | MD (IV, fixed, 95% CI) | 0% with 0.86 | −14.26 (−14.81, −13.71) | <0.00001 |
| CA199 | 242 | 2 | MD (IV, fixed, 95% CI) | 19% with 0.27 | −138.87 (−143.21, −132.52) | <0.00001 |
CEA, carcinoembryonic antigen; CA199, carbohydrate antigen 19-9; MD, mean difference; 95% CI, 95% confidence interval.
