Subgroup | Studies n | Incidence rate ratio (95% CI) | I2* | Study references |
Gender† | 3 | 1.22 (0.94 to 1.57) | 0% | 33 43 50 |
Age‡ | 2 | 0.25 (0.09 to 0.65) | 62% | 33 50 |
*Heterogeneity was quantified by the heterogeneity variance, using the inconsistency index (I2) test (range from 0% to 100%). We regarded values greater than 25%, 50% and 75% for the I2 as indicative of low, moderate and high statistical heterogeneity, respectively.
†Male versus female.
‡<60 years vs ≥60 years.
FOBT, faecal occult blood test; iCRC, interval colorectal cancer.