Median age at first surgery in boys who attended a check versus those who did not.
| Attended check | Did not attend check | ||
|---|---|---|---|
| Check | Age at surgery (95%CI) | Age at surgery (95%CI) | P-value |
| 6–8 weeks | 2.7 years (3.4 to 4.6) | 7.7 years (5.5 to 9.5) | <0.001 |
| 8–9 months | 4.5 years (4.5 to 6.1) | 9.7 years (8.3 to 12.0) | <0.001 |
| 39–42 months | 7.7 years (6.8 to 9.0) | 10.8 years (8.7 to 13.1) | 0.014 |