Characteristics of moderately preterm and term-born children
| Mean gestational age (weeks) | Preterm (n=916) 34.0 (SD 1.0) | Term (n=543) 39.6 (SD 1.0) | |
|---|---|---|---|
| Mean birth weight (g) | 2244 (SD 465) % (n) | 3553 (SD 488) % (n) | p Value |
| Gestational age (weeks) | |||
| 32 | 11.5 (105) | ||
| 33 | 20.1 (184) | ||
| 34 | 27.8 (255) | ||
| 35 | 40.6 (372) | ||
| 38 | 17.1 (93) | ||
| 39 | 26.2 (142) | ||
| 40 | 35.9 (195) | ||
| 41 | 20.8 (113) | ||
| SGA* | 9.2 (84/916) | 7.7 (42/543) | 0.4 |
| Gender (male) | 57.2 (524/916) | 49.2 (267/543) | 0.003 |
| Age of child (months)† | 0.6 | ||
| <43 | 0.9 (7/768) | 0.6 (3/467) | |
| 43–47 | 89.6 (688/768) | 91.4 (427/467) | |
| >47 | 9.5 (73/768) | 7.9 (37/467) | |
| Family composition | 0.005 | ||
| Two-parent family | 92.7 (845/912) | 96.3 (517/537) | |
| One-parent family | 7.3 (67/912) | 3.7 (20/537) | |
| Number of siblings | 0.006 | ||
| 0 | 18.6 (170/916) | 12.5 (68/543) | |
| 1 | 54.5 (499/916) | 55.2 (300/543) | |
| 2 | 20.7 (190/916) | 23.2 (126/543) | |
| ≥3 | 6.2 (57/916) | 9.0 (49/543) | |
| Maternal age (years) | 0.05 | ||
| <25 | 8.5 (75/885) | 6.1 (32/526) | |
| 25–34 | 73.6 (651/885) | 71.5 (376/526) | |
| >34 | 18.0 (159/885) | 22.4 (118/526) | |
| Maternal educational level‡ | 0.08 | ||
| Low | 30.5 (278/912) | 25.6 (138/539) | |
| Medium | 43.0 (392/912) | 43.6 (235/539) | |
| High | 26.5 (242/912) | 30.8 (166/539) | |
| Maternal ethnicity | 0.6 | ||
| Netherlands | 94.2 (856/909) | 95.1 (507/533) | |
| Europe | 1.8 (16/909) | 1.9 (10/533) | |
| Outside Europe | 4.1 (37/909) | 3.0 (16/533) | |
↵* SGA, small for gestational age, that is, birth weight below the 10th percentile of the Dutch Kloosterman growth charts.
↵† Age at completing the Child Behavior Checklist.
↵‡ Low, primary school or less and/or low-level technical and vocational training; medium, high school or medium-level technical and vocational training for 12–16 years; high, university or high-level technical and vocational training for >16 years.