EP children Z-score (SD)Controls Z-score (SD)Difference of means (95% CI)Change in Z-score 30 months to 11 years
Height−0.55 (1.02)0.15 (1.01)0.71 (0.50 to 0.92)**+0.20 (−0.02 to 0.42)
Weight−0.42 (1.28)0.21 (1.17)0.62 (0.37 to 0.88)**+0.79 (0.53 to 1.05)**
BMI−0.22 (1.38)0.17 (1.26)0.39 (0.11 to 0.66)*+0.80 (0.52 to 1.08)**
OFC−1.27 (1.25)0.15 (0.99)1.26 (1.02 to 1.50)**+0.25 (−0.02 to 0.51)
  • BMI, body mass index; EP, extremely preterm; OFC, occipito-frontal circumference. *p<0.01; **p<0.001.