Table 4 Estimated Bayley Scales III raw scores from linear mixed models and 95% confidence intervals for gross motor skills, fine motor skills, cognitive skills, receptive communication skills and expressive communication skills
Bayley scale | Age (months) | NBW | LBW | Absolute Difference (SE) | p-value | ||
|---|---|---|---|---|---|---|---|
Estimated score | 95%CI | Estimated score | 95%CI | ||||
Gross Motor skills | 6 | 25.7 | 24.7–26.7 | 21.2 | 20.4–22.0 | 4.5(0.7) | < 0.001 |
12 | 40.6 | 39.6–41.6 | 37.3 | 36.6–38.1 | 3.3(0.6) | < 0.001 | |
18 | 47.7 | 46.8–48.6 | 44.8 | 44.2–45.5 | 2.8(0.6) | < 0.001 | |
24 | 54.7 | 53.7–55.7 | 52.3 | 51.6–53.1 | 2.4(0.6) | < 0.001 | |
Fine motor skills | 6 | 19.4 | 18.8–20.0 | 17.4 | 16.9–17.9 | 1.9 (0.4) | < 0.001 |
12 | 28.9 | 28.3–29.5 | 28.8 | 28.3–29.2 | 0.1 (0.4) | 0.70 | |
18 | 32.9 | 32.4–33.4 | 32.3 | 31.9–32.7 | 0.6 (0.3) | 0.06 | |
24 | 36.8 | 36.2–37.4 | 35.8 | 35.4–36.3 | 1.0 (0.4) | 0.008 | |
Cognitive skills | 12 | 39.2 | 37.9–40.5 | 38.1 | 37.1–39.2 | 1.0 (0.9) | 0.22 |
18 | 50.4 | 49.1–51.8 | 47.8 | 46.7–48.9 | 2.6 (0.9) | 0.003 | |
24 | 56.3 | 54.9–57.6 | 53.9 | 53.0–54.9 | 2.3 (0.8) | 0.005 | |
Receptive communication skills | 12 | 12.9 | 12.3–13.5 | 11.7 | 11.2–12.2 | 1.2 (0.4) | 0.003 |
18 | 18.2 | 17.6–18.8 | 17.5 | 17.0–18.0 | 0.7 (0.4) | 0.07 | |
24 | 23.8 | 23.2–24.4 | 22.4 | 22.0–22.8 | 1.4(0.4) | < 0.001 | |
Expressive communication skills | 12 | 12.5 | 11.6–13.3 | 12.0 | 11.3–12.7 | 0.5 (0.6) | 0.43 |
18 | 18.4 | 17.5–19.3 | 16.3 | 15.6–17.1 | 2.1 (0.6) | < 0.001 | |
24 | 25.1 | 24.2–26.0 | 22.7 | 22.1–23.4 | 2.3 (0.5) | < 0.001 | |