TABLE 5.

Multivariate Analysis of Correlates of Weight, Height, and BMI z Scores at 20 Years of VLBW Males and Females

Independent VariablesWeightHeightBMI
β Coefficient95% CIβ Coefficient95% CIβ Coefficient95% CI
Males
 Education
  <High school−0.57−1.16, 0.030.005−0.43, 0.44−0.68−1.33, −0.04*
  High school−0.32−1.29, 0.66−0.60−1.31, 0.110.001−1.05, 1.06
 Race (black)§0.35−0.21, 0.920.13−0.28, 0.540.38−0.23, 1.00
 Maternal height (cm)0.03−0.01, 0.080.070.04, 0.10***−0.005−0.05, 0.04
 Birth weight z score0.10−0.09, 0.300.180.04, 0.32*0.01−0.20, 0.22
 Neonatal stay−0.07−0.72, 0.57−0.62−1.09, −0.15*0.21−0.49, 0.92
 Chronic illness§§−0.43−1.20, 0.330.08−0.48, 0.64−0.56−1.39, 0.27
 R20.130.400.10
Females
 Education
  <High school−0.10−0.71, 0.52−0.09−0.66, 0.48−0.07−0.55, 0.42
  High school0.17−0.66, 1.00−0.27−1.03, 0.500.21−0.44, 0.87
 Race (black)§0.630.12, 1.14*0.24−0.23, 0.710.540.14, 0.95**
 Maternal height (cm)0.03−0.01, 0.070.040.01, 0.08*0.01−0.02, 0.04
 Birth weight z score0.12−0.11, 0.340.210.004, 0.42*0.001−0.18, 0.18
 Neonatal stay0.07−0.36, 0.49−0.09−0.48, 0.310.16−0.18, 0.49
 Chronic illness§§0.850.22, 1.49**−0.07−0.65, 0.520.780.27, 1.28**
 R20.230.160.26
  • CI indicates confidence interval.

  • * P < .05.

  • ** P < .01.

  • *** P < .001.

  • Refers to the unstandardized coefficient of the independent variable in the linear regression model with weight z score as the dependent variable and containing maternal education, race and height, birth weight z score, neonatal hospital stay and chronic illness.

  • Maternal status at child’s eighth year. Reference group consists of mothers with more than high school education.

  • § Maternal race used, coded as 1 black, 0 white.

  • Natural log of the length of the neonatal hospital stay (in days).

  • §§ At 20 years. Includes medical or psychiatric illness lasting 12 months or more.