Table 13. Disease-free survival at 10 years - analysis of subgroups.
--: Not available/applicable
| Subgroup | k | Effect Size (HR) (95%CI) | I2 (%) | p-value (subgroup difference) |
| RoB (Risk of Bias) | ||||
| Low | 5 | 1.1161 (0.7908; 1.5751) | 96.4 | -- |
| Country | ||||
| Korea | 2 | 1.2835 (0.9720; 1.6948) | 0.0 | < 0.0001 |
| China | 1 | 0.8125 (0.5466; 1.2077) | -- | -- |
| Norway | 1 | 0.7500 (0.6777; 0.8301) | -- | -- |
| USA | 1 | 1.7143 (1.5233; 1.9292) | -- | -- |
| Year | ||||
| 2008 | 1 | 1.2667 (0.9320; 1.7215) | -- | 0.3247 |
| 2022 | 1 | 0.8125 (0.5466; 1.2077) | -- | -- |
| 2015 | 2 | 1.1332 (0.5041; 2.5477) | 99.1 | -- |
| 2021 | 1 | 1.3636 (0.7066; 2.6317) | -- | -- |
| Study Design | ||||
| Cohort Study | 5 | 1.1161 (0.7908; 1.5751) | 96.4 | -- |
| Intervention | ||||
| Breast-conserving surgery with RT | 3 | 1.1725 (0.7181; 1.9144) | 98.2 | 0.6163 |
| Breast-conserving surgery | 2 | 0.9822 (0.6024; 1.6017) | 42.8 | -- |
| Type of Breast Cancer | ||||
| Not specified | 1 | 1.2667 (0.9320; 1.7215) | -- | 0.5578 |
| Multiple | 4 | 1.0812 (0.7022; 1.6648) | 97.3 | -- |
| Stage of Breast Cancer | ||||
| I, IIA | 1 | 1.2667 (0.9320; 1.7215) | -- | < 0.0001 |
| I, II, III, IV | 1 | 0.8125 (0.5466; 1.2077) | -- | -- |
| I, II, III | 1 | 0.7500 (0.6777; 0.8301) | -- | -- |
| I, II | 1 | 1.3636 (0.7066; 2.6317) | -- | -- |
| I, IIA, IIb | 1 | 1.7143 (1.5233; 1.9292) | -- | -- |