TABLE 2.
Comparing BMI for boys and girls by study group: age 30 months—age 12 years
| FT | HPT | MPT | NPT | SGA | |
|---|---|---|---|---|---|
| Boys | |||||
| CDC norms 50th (3rd & 97th) percentile | |||||
| 30 mo | |||||
| 16.2 (14.3–9.1) | |||||
| Mean (SD) | 16.0 (1.1) | 14.6 (1.4) | 15.5 (1.7) | 14.6 (1.6) | 14.6 (.36) |
| 95% CI | 15.4–16.5 | 13.0–16.1 | 14.7–16.2 | 13.7–15.5 | 14.3–15 |
| *Diff from 50th percentile | −.2 | −1.6 | −.7 | −1.6 | −1.6 |
| n < 3rd percentile | 1 | 3 | 4 | 7 | 1 |
| 4 years | |||||
| 15.6 (13.8–18.3) | |||||
| Mean (SD) | 15.7 (1.9) | 15.4 (1.4) | 15.4 (1.8) | 15.6 (4.7) | 16.4 (5.7) |
| 95% CI | 14.7–16.8 | 14.4–16.5 | 14.6–16.1 | 13.4–17.8 | 11.9–20.8 |
| *Diff from 50th percentile | +.1 | −.2 | +.2 | 0 | +.8 |
| n < 3rd percentile | 3 | 2 | 5 | 6 | 2 |
| Age 8 years | |||||
| 15.8 (13.6–21.1) | |||||
| Mean (SD) | 17.2 (2.3) | 16.7 (3.5) | 15.8 (1.4) | 15.8 (1.8) | 15.5 (1.1) |
| 95% CI | 16.1–18.3 | 14.1–19.2 | 15.2–16.4 | 14.9–16.6 | 14.7–16.3 |
| *Diff from 50th percentile | +2.2 | +.9 | 0 | 0 | −.3 |
| n < 3rd percentile | 0 | 1 | 1 | 2 | 0 |
| Age 12 years | |||||
| 16.8 (14.6–26) | |||||
| Mean (SD) | 21.7 (4.5) | 18.3 (3.1) | 18.6 (2.7) | 18.4 (3.7) | 19.9 (4.1) |
| 95% CI | 19.7–23.7 | 16.1–20.5 | 17.4–19.7 | 16.7–20.2 | 16.4–23.3 |
| *Diff from 50th percentile | +4.9 | +1.5 | +1.8 | +1.6 | +3.1 |
| n < 3rd percentile | 0 | 1 | 0 | 2 | 0 |
| Girls | |||||
| CDC norms 50th (3rd & 97th) percentile | |||||
| 30 months | |||||
| 16.0 (14–19) | |||||
| Mean (SD) | 15.7 (1.7) | 15.8 (2.2) | 15.3 (1.4) | 16.8 (2.5) | 16.2 (3.4) |
| 95% CI | 14.9–16.5 | 14.6–17.1 | 14.6–15.9 | 14.9–18.7 | 14.5–17.8 |
| *Diff from 50th percentile | −.3 | −.2 | −.7 | +.8 | +.2 |
| n < 3rd percentile | 2 | 2 | 4 | 1 | 4 |
| 4 years | |||||
| 15.4 (13.5–18.6) | |||||
| Mean (SD) | 16.3 (1.4) | 15.8 (1.8) | 15.7 (1.6) | 15.5 (1.9) | 14.6 (1.4) |
| 95% CI | 15.7–17.0 | 24.9–16.8 | 15.0–16.5 | 14.1–16.9 | 13.9–15.3 |
| *Diff from 50th percentile | +.9 | +.4 | +.3 | +.1 | −.8 |
| n < 3rd percentile | 0 | 1 | 0 | 1 | 2 |
| 8 years | |||||
| 15.8 (13.4–21.9) | |||||
| Mean (SD) | 17.3 (3.1) | 17.3 (3.9) | 17.1 (3.2) | 15.5 (2.2) | 16.0 (2.6) |
| 95% CI | 16.0–18.7 | 15.5–19.0 | 15.8–18.3 | 13.9–17.1 | 14.8–17.2 |
| *Diff from 50th percentile | +1.5 | +1.5 | +1.3 | −.3 | +.2 |
| n < 3rd percentile | 0 | 1 | 1 | 1 | 0 |
| 12 years | |||||
| 18.0 (14.5–27) | |||||
| Mean (SD) | 21.4 (4.2) | 22.4 (6.3) | 19.8 (4.0) | 19.2 (2.6) | 19.9 (4.8) |
| 95% CI | 19.5–23.4 | 19.4–25.5 | 18.2–21.4 | 17.4–21.1 | 17.7–22.2 |
| *Diff from 50th percentile | +3.4 | +4.4 | +1.8 | +1.2 | +1.9 |
| n < 3rd percentile | 0 | 0 | 1 | 0 | 1 |
FT, Full-term group; HPT, healthy preterm group; MPT, medical preterm group; NPT, neurologic preterm group; SGA, small for gestational age preterm group.
Univariate analysis of variance test of neonatal group: (boys) 30 m: FT > all; 12 years: FT > MPT, NPT, HPT; (girls) 4 years: FT > SGA.
*
Diff = mean difference.