TABLE 4.

Comparison of Weight, Height, and BMI Between VLBW and NBW Participants at 8 and 20 Years

MalesFemales
VLBW (N = 103)NBW (N = 101)Mean Difference or Odds Ratio§ (95% CI)VLBW (N = 92)NBW (N = 107)Mean Difference or Odds Ratio§ (95% CI)
8 y††
 Weight
  Mean (kg ± SD)26.9 ± 5.131.1 ± 6.3−4.3 (−5.9, −2.7)***28.0 ± 6.331.7 ± 8.1−3.6 (−5.7, −1.5)**
  z score ± SD−0.46 ± 1.310.34 ± .96−0.78 (−1.10, −0.46)***−0.23 ± 1.140.20 ± 1.10−0.39 (−0.71, −0.07)*
  Less than −2 SD11 (11%)1 (1%)10.6 (1.3, 85.3)*3 (4%)2 (2%)2.0 (0.3, 13.2)
 Height
  Mean (cm ± SD)129.2 ± 6.4133.1 ± 5.9−3.9 (−5.6, −2.1)***130.2 ± 7.6133.2 ± 7.0−2.9 (−5.0, −0.8)**
  z score ± SD−0.45 ± 1.040.02 ± 0.91−0.46 (−0.74, −0.18)**−0.20 ± 1.160.03 ± 1.04−0.21 (−0.52, 0.10)
  Less than −2 SD8 (8%)3 (3%)2.6 (0.7, 10.3)5 (6%)2 (2%)2.7 (0.5, 15.0)
 BMI
  Mean (kg/m2 ± SD)16.0 ± 2.217.4 ± 2.6−1.5 (−2.1, −0.8)***16.3 ± 2.317.7 ± 3.1−1.3 (−2.1, −0.5)**
  z score ± SD−0.35 ± 1.210.38 ± 0.94−0.72 (−1.03, −0.42)***−0.16 ± 1.050.29 ± 1.03−0.41 (−0.72, −0.11)**
20 y§§
 Weight
  Mean (kg ± SD)69.2 ± 13.979.9 ± 16.7−10.5 (−14.8, −6.2)***64.9 ± 16.867.6 ± 18.3−2.0 (−6.9, 2.8)
  z score ± SD−0.35 ± 1.250.53 ± 1.06−0.86 (−1.19, −0.54)***0.26 ± 1.170.45 ± 1.16−0.14 (−0.47, 0.18)
  Less than −2 SD11 (11%)0 (2.23, ∞)2 (2%)3 (3%)0.8 (0.1, 5.1)
 Height
  Mean (cm ± SD)173.7 ± 7.9177.0 ± 6.8−3.1 (−5.2, −1.1)**161.7 ± 7.3163.0 ± 7.0−1.2 (−3.2, 0.9)
  z score ± SD−0.44 ± 1.100.03 ± 0.95−0.44 (−0.72, −0.15)**−0.26 ± 1.13−0.06 ± 1.08−0.18 (−0.50, 0.14)
  Less than −2 SD7 (7%)3 (3%)2.3 (0.6, 9.3)5 (5%)1 (1%)4.0 (0.4, 36.4)
 BMI
  Mean (kg/m2 ± SD)22.9 ± 4.225.5 ± 4.9−2.6 (−3.8, −1.3)***24.7 ± 5.225.4 ± 6.2−0.5 (−2.1, 1.0)
  z score ± SD−0.33 ± 1.240.42 ± 1.09−0.75 (−1.08, −0.43)***0.42 ± 0.930.45 ± 1.240.03 (−0.27, 0.34)
  • CI indicates confidence interval.

  • * P < .05.

  • ** P < .01.

  • *** P < .001.

  • Adjusted for maternal education and race.

  • § Odds ratio pertains to rates of subnormal (less than −2 SD) weight and height.30

  • Infinite odds ratio.

  • 99 male and 87 female VLBW and all the NBW subjects had weight and height measurements at age 8 years.

  • †† For males, mean age at the 8-year assessment was 8.7 years for VLBW and 8.9 years for NBW subjects. For females, mean age at the 8-year assessment was 8.6 years for VLBW and 9.0 years for NBW subjects.

  • §§ For males, mean age at the 20-year assessment was 20.2 years for VLBW and 20.1 years for NBW subjects. For females, mean age at the 20-year assessment was 20.1 years for VLBW and 20.1 years for NBW subjects.