Table 1.
Demographic information, IQ scores, and growth parameter at the four assessment time-points, for participants born between 1978 and 1993.
| 4 Year | 9 Year | 14 Year | 18 Year | |
|---|---|---|---|---|
| Number of participants (N) | 229 | 218 | 205 | 200 |
| Males [n (%)] | 120 (52%) | 114 (52%) | 108 (53%) | 102 (51%) |
| Family SES (Mdn [IQR]) | 5 [4, 6] | 5 [4, 6] | 5 [4, 6] | 5 [4, 6] |
| Birth weight [g]; M (SD) | 3289 (434) | 3282 (431) | 3273 (426) | 3264 (412) |
| Head circumference [cm]; M (SD) | 50.7 (1.3) | 52.8 (1.3) | 54.9 (1.5) | 56.2 (1.7) |
| Height males [cm]; M (SD) | 104.2 (4.0) | 134.2 (5.4) | 163.6 (8.4) | 177.4 (6.7) |
| Height females [cm]; M (SD) | 102.9 (3.5) | 133.7 (4.7) | 161.8 (5.3) | 165.5 (4.8) |
| Weight males [kg]; M (SD) | 16.8 (1.9) | 28.9 (4.6) | 52.2 (10.9) | 69.7 (11.7) |
| Weight females [kg]; M (SD) | 16.1 (1.7) | 29.2 (5.2) | 51.5 (8.9) | 58.7 (8.4) |
| Bone age [years]; M (SD) | Not available | Not available | 13.9 (1.1) | 17.5 (0.9) |
| Full scale IQ; M (SD) | 116.1 (11.4) | 104.1 (11.3) | 111.3 (10.8) | Not available |
Mdn, median; IQR, interquartile range; M, mean; SD, Standard Deviation; SES, socioeconomic status based on a composite score of parents’ education and occupation, with scores ranging from 2 to 10 (higher scores indicating a lower SES).