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Details of Patients in the Five Groups
| Group | Ec | Es | U1 | U2 | U3 |
|---|---|---|---|---|---|
| Number | 84 | 23 | 23 | 18 | 27 |
| F:M | 1.5:1 | 4.75:1 | 4.75:1 | 3.5:1 | 4.4:1 |
| Age at operation, mean | 11.2 | 9.6 | 9.8 | 11.1 | 11.9 |
| Age at operation, median | 12.7 | 8.4 | 9.0 | 11.5 | 12.0 |
| Age at exposure, median | 1.49 | 1.48 | −2.64 |
Note that the Es group was selected from among exposed patients to match the unexposed group from the same area (U1) for age and gender.
Ec: exposed, control; Es: exposed, selected.
