Table 3

Specific neurosensory impairments at age eight by gestational age (weeks), 1997

Gestational age22, n=123, n=924, n=1225, n=3926, n=4427, n=39Total preterm, n=144Term, n=173
CP* (%)10022.20.07.911.613.211.3†0†
Blindness‡ (%)0.00.08.32.60.02.62.10
Hearing impairment§ (%)0.00.00.02.64.50.02.10
Intellectual impairment
  Severe (%)10022.20.07.76.80.06.30.6
  Moderate (%)011.116.77.74.510.88.52.4
  Mild (%)044.433.325.647.743.238.710.0
  Zero (%)022.250.059.040.945.946.587.1
Mean (SD) FSIQ¶47.079.1 (17.1)91.9 (13.2)94.3 (17.4)91.7 (16.9)95.9 (12.2)92.4 (16.4)**105.6 (12.4)**
  • CP, cerebral palsy; FSIQ, full scale intelligence quotient.

  • * χ2 trend by gestational age in preterm cohort alone =0.15, p=0.70.

  • Three 22–27 weeks and three term children did not have CP data available.

  • χ2 trend by gestational age in preterm cohort alone =0.18, p=0.68.

  • § χ2 trend by gestational age in preterm cohort alone =0.01, p=0.94.

  • One-way analysis of variance (ANOVA) by gestational age in preterm cohort alone: Fdf5,136=3.48, p=0.005.

  • ** Two 22–27 weeks and †three term children did not have sufficient data for IQ scores to be assigned.