TABLE 3

Comparisons of Outcomes Between Birth Weight and GA Subgroups

OutcomeMean ± SD Birth WeightMean Difference (95% CI)
<750 g(n = 60)750–999 g(n = 96)
WISC-IV
 FSIQ91.3 (12.9)a95.5 (15.2)−4.2 (–9.0 to –0.6), P = .09
 Verbal comprehension90.2 (12.2)b 95.7 (12.6)–5.5 (–9.6 to –1.4), P = .009
 Perceptual reasoning93.4 (14.9)c99.0 (14.8)b –5.6 (–10.5 to – 0.7), P = .025
 Working memory92.3 (15.5)b 96.6 (14.8)−4.3 (–9.3 to 0.7), P = .09
 Processing speed92.3 (15.4)d96.8 (13.6)b −4.6 (–9.3 to –0.2), P = .06
WRAT3
 Reading93.7 (16.5)c100.8 (14.8)a–7.1 (–12.2 to –2.0), P = .007
 Spelling93.3 (15.9)c99.5 (14.3)d–6.2 (–11.1 to – 1.3), P = .014
 Arithmetic85.3 (17.0)d92.2 (15.9)a–6.9 (–12.4 to –1.4), P = .014
SDQ
 Total11.2 (6.6)10.6 (6.3)0.5 (–1.6 to 2.6), P = .62
 Emotional symptoms3.0 (2.5)2.8 (2.3)0.2 (–0.5 to 1.0), P = .56
 Conduct problems1.6 (1.6)1.7 (1.9)−0.1 (–0.7 to 0.5), P = .67
 Hyperactivity/inattention4.3 (2.8)4.1 (2.6)0.2 (–0.7 to 1.1), P = .68
 Peer relationships2.3 (2.2)2.0 (2.0)0.3 (–0.4 to 1.0), P = .43
 Prosocial behavior8.3 (2.0)8.3 (1.8)0.0 (–0.6 to 0.6), P = .93
 Impact1.4 (2.5)0.9 (1.7)0.5 (–0.2 to 1.1), P = .15
Mean ± SD GA
Outcome23–25 wk (n = 59)26–27 wk (n = 79)Mean Difference (95% CI)
WISC-IV
 FSIQ93.5 (14.8)d95.3 (12.3)a−1.7 (–6.4 to 3.0), P = .46
 Verbal comprehension93.7 (12.2)93.7 (11.0)a−0.0 (–4.0 to 4.0), P = .99
 Perceptual reasoning94.6 (16.2)c99.7 (12.5)a–5.1 (–10.0 to – 0.2), P = .04
 Working memory94.5 (16.6)95.0 (12.2)a−0.5 (–5.4 to 4.4), P = .84
 Processing speed93.7 (16.0)d97.9 (12.3)e−4.2 (–9.1 to 0.7), P = .09
WRAT3
 Reading95.3 (15.5)d98.7 (17.5)d−3.4 (–9.2 to 2.4), P = .25
 Spelling95.9 (14.0)d97.1 (17.2)b−1.2 (–6.7 to 4.4), P = .67
 Arithmetic87.4 (15.8)e92.3 (17.8)d−4.8 (–10.8 to 1.2), P = .11
SDQ
 Total10.1 (6.8)11.3 (6.1)−1.2 (–3.4 to 1.0), P = .29
 Emotional symptoms2.3 (2.2)3.3 (2.4)–0.9 (–1.7 to –0.1), P = .02
 Conduct problems1.7 (1.8)1.7 (1.7)0.1 (–0.5 to 0.7), P = .78
 Hyperactivity/inattention4.2 (2.9)4.4 (2.7)−0.2 (–1.1 to 0.8), P = .74
 Peer relationships1.9 (2.2)2.0 (1.8)−0.1 (–0.8 to 0.6), P = .70
 Prosocial behavior8.3 (2.0)8.4 (1.8)−0.1 (–0.7 to 0.6), P = .80
 Impact1.1 (2.2)1.2 (1.9)−0.1 (–0.8 to 0.6), P = .81
  • a n = 4 with missing data.

  • b n = 2 with missing data.

  • c n = 1 with missing data.

  • d n = 3 with missing data.

  • e n = 5 with missing data.