TABLE 2.

VLBW Participants: Weight and Height Measures From Birth to 20 Months Corrected Age

WeightHeight
NMean ± SD (kg)z Score ± SD*Less Than −2 SD*NMean ± SD (cm)z Score ± SD*Less Than −2 SD*
Males
 Birth1031.2 ± 0.2−0.73 ± 1.3419 (18%)7238 ± 3−1.18 ± 2.1619 (26%)
 40 wk (term)1012.6 ± 0.7−1.79 ± 1.4458 (57%)8546 ± 3−2.56 ± 1.7151 (60%)
 8 mo997.8 ± 1.3−1.70 ± 1.4838 (38%)9669 ± 4−0.94 ± 1.5322 (23%)
 20 mo10011.0 ± 1.7−1.16 ± 1.4324 (24%)10083 ± 5−0.55 ± 1.2613 (13%)
Females§
 Birth921.2 ± 0.2−1.12 ± 1.0920 (22%)5939 ± 3−1.22 ± 1.6517 (29%)
 40 wk (term)902.5 ± 0.5−2.00 ± 1.0245 (50%)7546 ± 3−2.38 ± 1.3845 (60%)
 8 mo917.6 ± 1.2−1.09 ± 1.3519 (21%)9168 ± 4−0.51 ± 1.189 (10%)
 20 mo9010.8 ± 1.5−0.82 ± 1.3716 (18%)8983 ± 5−0.16 ± 1.379 (10%)
  • * Usher’s norms used at birth and 40 weeks26 and CDC norms30 at 8 months and 20 months corrected age.

  • For males, mean corrected ages for growth measures were 40.3 weeks at the term assessment, 8.6 months at the 8-month assessment, and 21.1 months at the 20-month assessment.

  • § For females, mean corrected ages for growth measures were 39.9 weeks at the term assessment, 8.5 months at the 8-month assessment, and 20.5 months at the 20-month assessment.