Cases and controls, stratified by gestational age band
| ⩽32 weeks | 33–36 weeks | ⩾37 weeks | ||||
|---|---|---|---|---|---|---|
| Cases | Controls | Cases | Controls | Cases | Controls | |
| *One of the missing cases also had a developmental brain abnormality. | ||||||
| Eligible | 75 | 291 | 41 | 82 | 161 | 286 |
| Missing records* | 0 | 6 | 0 | 6 | 4 | 1 |
| Excluded (developmental brain lesion) | 2 | 0 | 5 | – | 31 | |
| Reallocation of controls to correct gestational age band | 0 | 1 added | 0 | 6 removed | 0 | 5 added |
| Final number included in study | 73 | 286 | 36 | 70 | 126 | 290 |