Table 2.
Means and standard deviations of postterm age, postnatal age, gestational length, birth weight and birth height. Data are divided into different postterm age groups, separately for preterm and fullterm infants.
| Age category (months) | Data points (#) | Postterm age at test (months) | Postnatal age at test (months) | Gestation length (weeks) | Birth weight (lb) | Birth height (in.) |
|---|---|---|---|---|---|---|
| Preterm infants | ||||||
| 1 | 5 | 1.1 (0.3) | 2.6 (0.6) | 33.5 (1.4) | 4.9 (1.4) | 17.9 (1.9) |
| 2 | 7 | 2.1 (0.3) | 3.7 (0.5) | 32.9 (1.3) | 4.6 (0.6) | 18.7 (1.5) |
| 3 | 11 | 3.1 (0.3) | 4.7 (0.4) | 33.3 (1.0) | 4.7 (0.7) | 17.9 (0.8) |
| 4 | 15 | 4.0 (0.3) | 5.4 (0.4) | 33.7 (1.1) | 5.0 (0.7) | 18.8 (1.2) |
| 5 | 9 | 5.0 (0.2) | 6.5 (0.4) | 33.7 (1.2) | 4.8 (0.5) | 17.9 (0.9) |
| 6 | 6 | 5.9 (0.1) | 7.3 (0.1) | 34.0 (1.0) | 5.1 (0.7) | 17.9 (1.2) |
| Fullterm infants | ||||||
| 2 | 24 | 2.1 (0.2) | 2.1 (0.1) | 39.8 (0.7) | 7.6 (1.0) | 19.8 (1.0) |
| 3 | 17 | 3.0 (0.3) | 3.1 (0.3) | 40.0 (0.6) | 7.9 (1.2) | 19.9 (1.9) |
| 4 | 21 | 4.1 (0.2) | 4.1 (0.2) | 40.0 (0.5) | 8.1 (1.0) | 20.6 (1.2) |
| 5 | 15 | 5.1 (0.2) | 5.1 (0.2) | 40.0 (0.6) | 7.8 (0.7) | 20.6 (0.9) |
| 6 | 16 | 6.0 (0.2) | 6.1 (0.2) | 39.8 (0.6) | 7.8 (1.4) | 20.3 (1.6) |
| 7 | 7 | 6.9 (0.3) | 7.0 (0.2) | 39.8 (0.9) | 8.0 (1.1) | 20.6 (0.4) |