Table 4

Neurodevelopmental outcome at 2.5 years corrected age by gestational week

Gestational age, weeks22–24 (n=133)22 (n=20)23 (n=53)24 (n=60)P value
Cerebral palsy10 (8)1 (5)2 (4)7 (12)ns
Mild5 (4)1 (5)2 (4)2 (3)
Moderate-severe5 (4)0 (0)0 (0)5 (8)
Visual impairment11 (8)3 (15)8 (15)0 (0)ns*
<0.01†
Mild5 (4)1 (5)4 (8)0 (0)
Moderate-severe6 (4)2 (10)4 (8)0 (0)
Hearing impairment2 (2)1 (5)0 (0)1 (2)ns
Mild1 (1)0 (0)0 (0)1 (2)
Moderate1 (1)1 (5)0 (0)0 (0)
Developmental delay36 (27)10 (50)16 (30)10 (17)ns*‡
<0.01†
Mild21 (16)4 (20)§11 (21)¶6 (10)§
Moderate-severe15 (11)6 (30)¶5 (9)**4 (7)§
Unimpaired88 (66)10 (50)§33 (62)††45 (75)‡‡ns
  • Data shown as n (%).

  • *Week 22 vs 23.

  • †Week 22 vs 24.

  • ‡Week 23 vs 24.

  • §Bayley scale assessment, n: 1.

  • ¶Bayley scale assessment, n: 3.

  • **Bayley scale assessment, n: 2.

  • ††Bayley scale assessment, n: 13.

  • ‡‡Bayley scale assessment, n: 21.