Table 1 Characteristics of participants and non-participants at age 28
Participants n (%) | Non-participants #n (%) | p-value | ||
|---|---|---|---|---|
Sex* | Male | 119 (38) | 360 (59) | < 0.001 |
Female | 195 (62) | 254 (41) | ||
Birth weight (grams) | <=1000 | 46 (15) | 93 (15) | < 0.825 |
1001-1250 | 89 (28) | 169 (26) | ||
1251-1500 | 111 (35) | 258 (40) | ||
>1500 | 68 (22) | 123 (19) | ||
Origin* | Dutch | 293 (94) | 500 (82) | <0.001 |
Non-Dutch | 18 (6) | 110 (18) | ||
Educational level (parents)* | Low | 81 (26) | 254 (46) | <0.001 |
Middle | 120 (38) | 197 (36) | ||
High | 113 (36) | 103 (18) | ||
SES (parents)* | Low | 97 (31) | 292 (48) | <0.001 |
Middle | 101 (32) | 181 (30) | ||
High | 114 (37) | 135 (22) | ||
Appropriate for gestational age | Yes | 189 (60) | 390 (64) | 0.351 |
No, small | 124 (40) | 224 (36) | ||
Maternal age at time of birth (years) | <20 | 11 (4) | 54 (8) | 0.065 |
>=20 and | 289 (92) | 566 (88) | ||
<36 | 14 (4) | 23 (4) | ||
>=36 | ||||
Disability at age 5* | None | 89 (29) | 119 (20) | <0.001 |
Mild | 215 (69) | 427 (71) | ||
Severe | 8 (2) | 53 (9) | ||
Disability at age 10 | None | 142 (51) | 205 (50) | 0.058 |
Mild | 119 (43) | 149 (37) | ||
Severe | 18 (6) | 52 (13) |