TABLE 2.
Differences in the cognitive development scores of children born to adolescent mothers according to age bands.
| Child cognitive development (Mullen scales of early learning; T‐scores) | Quartiles based on child age (months) | F, p‐value | |||
|---|---|---|---|---|---|
| 1 (n = 256) | 2 (n = 221) | 3 (n = 249) | 4 (n = 228) | ||
| Child age in months M(IQR) | 4 (3–5; range:2–6) | 10 (8–12; range:7–14) | 22 (18–24; range:15–28) | 38 (33–46.5; range:29–68) | |
| Gross motor* | 51.2 (9.9) | 50.7 (11.5) | 51.0 (13.0) | 42.5 (15.7)a,b, c | 16.9, <0.0001 |
| Visual reception | 53.1 (8.3) | 40.5 (11.0)a | 33.0 (13.4)a,b | 41.6 (14.9)a,c | 118.9, <0.0001 |
| Fine motor | 50.3 (8.9) | 43.2 (12.7)a | 41.0 (17.3)a | 40.5 (15.4)a | 25.5, <0.0001 |
| Receptive language | 58.2 (11.1) | 46.8 (11.3)a | 40.7 (10.2)a,b | 43.9 (13.9)a | 108.2, <0.0001 |
| Expressive language | 62.8 (8.9) | 49.5 (11.1)a | 43.9 (10.6)a.b | 49.8 (14.1)a,c | 127.4, <0.0001 |
| Composite score of early learning † | 112.2 (13.3) | 90.6 (15.8)a | 80.9 (18.8)a,b | 88.9 (21.7)a,c | 145.8, <0.0001 |
| Maternal age at birth of child (years) | 16.8 | 16.7 | 16.5 | 16.3 | 5.1, 0.002 |
Abbreviation: M(IQR), median (interquartile range).
Note: a: Tukey's HSD post hoc test indicates that value is significantly different from quartile 1 (p ≤ 0.05). b: Tukey's HSD post hoc test indicates that value is significantly different from quartile 2 (p ≤ 0.05). c: Tukey's HSD post hoc test indicates that value is significantly different from quartile 3 (p ≤ 0.05).
*
Gross motor scores n = 848.
†
Early Learning Composite Score: Age standardized composite score of fine motor, visual reception, expressive language, receptive language domains (range 49–155).