Subgroup analysis of the posterior capsule rupture rate when separating the two halves of the total cases of the residents
| Posterior capsule rupture | Without posterior capsule rupture | OR (95% CI) | P value | |
| First half of total cases | ||||
| Trained group (%) | 73 (8.8) | 755 (91.2) | 0.68 (0.49 to 0.95) | 0.02 |
| Untrained group (%) | 82 (12.4) | 576 (87.6) | ||
| Second half of total cases | ||||
| Trained group (%) | 67 (8.1) | 761 (91.9) | 0.98 (0.68 to 1.43) | 0.93 |
| Untrained group (%) | 54 (8.2) | 603 (91.8) |