Table 1 Characteristics of participants at ages 14 and 19 (n = 630); and non-participants at ages 14 and/or 19
| Â | Â | Participants n (%) | Non-participants n (%) |
|---|---|---|---|
Gender * | Male | 291 (46) | 180 (63) |
| Â | female | 339 (54) | 107 (37) |
Gestational age (weeks) | <28 | 70 (11) | 41 (14) |
|  | 28–29 | 64 (10) | 33 (12) |
|  | 29–30 | 99 (16) | 36 (13) |
|  | 30–31 | 113 (18) | 60 (21) |
|  | 31–32 | 113 (18) | 42 (15) |
| Â | >32 | 171 (27) | 75 (26) |
Birth weight (grams) | <=1000 | 96 (15) | 34 (12) |
|  | 1001–1250 | 166 (26) | 81 (28) |
|  | 1251–1500 | 237 (38) | 118 (41) |
| Â | >1500 | 131 (21) | 54 (19) |
Appropriate for gestational age | yes | 391 (62) | 182 (64) |
| Â | no | 238 (38) | 104 (36) |
Handicap at age 5 * | None | 489 (78) | 166 (51) |
| Â | Mild | 109 (17) | 94 (29) |
| Â | severe | 28 (4) | 34 (10) |
SES * | Low | 216 (34) | 152 (57) |
| Â | Middle | 207 (33) | 72 (27) |
| Â | high | 204 (32) | 45 (17) |