Participants’ characteristics (N=1452)
| Characteristics | n (%) |
| CP subtype | |
| BSCP | 824 (56.75) |
| USCP | 628 (43.25) |
| Intellectual disability | |
| None | 842 (57.99) |
| Mild | 200 (13.77) |
| Severe | 387 (26.65) |
| Missing information | 23 (1.58) |
| Gestational age | |
| VPT (<32 weeks) | 381 (26.24) |
| MPT (32–36+6 weeks) | 239 (16.46) |
| T (≥37 weeks) | 748 (51.52) |
| Missing information | 84 (5.79) |
| z BW | |
| −2 SD or less | 183 (12.60) |
| −2 to −1 SD | 267 (18.39) |
| −1 to +1 SD | 620 (42.70) |
| +1 to +2 SD | 128 (8.82) |
| +2 SD or more | 88 (6.06) |
| Missing information | 166 (11.43) |
| Sex | |
| Male | 837 (57.64) |
| Female | 615 (42.36) |
| GMFCS | |
| I | 274 (18.87) |
| II | 646 (44.49) |
| III | 138 (9.5) |
| IV | 95 (6.54) |
| V | 295 (20.32) |
| Missing data | 4 (0.28) |
| Multiple births | |
| No | 1329 (91.53) |
| Yes | 123 (8.47) |
BSCP, bilateral spastic cerebral palsy; CP, cerebral palsy; GMFCS, Gross Motor Function Classification System; MPT, moderately preterm; T, term; USCP, unilateral spastic cerebral palsy; VPT, very preterm; z BW, standardised birthweight scores.