Sensoneural disabilities at 2 years of age for ELBW children for each era
| Years of birth | Birthweight subgroup | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 500-749 g | 750-999 g | 500-999 g | |||||||||
| 1979-80 | 1985-87 | 1991-92 | 1979-80 | 1985-87 | 1991-92 | 1979-80 | 1985-87 | 1991-92 | |||
| Survivors assessed | 8 | 21 | 54 | 81 | 190 | 183 | 89 | 211 | 237 | ||
| Disability: | |||||||||||
| Nil | 1 (12.5%) | 18 (85.7%) | 33 (61.1%) | 46 (56.8%) | 133 (70.0%) | 136 (74.3%) | 47 (52.8%) | 151 (71.6%) | 169 (71.3%) | ||
| Mild | 4 (50.0%) | 1 (4.8%) | 11 (20.4%) | 19 (23.5%) | 32 (16.8%) | 24 (13.1%) | 23 (25.8%) | 33 (15.6%) | 35 (14.8%) | ||
| Moderate | 1 (12.5%) | 1 (4.8%) | 5 (9.3%) | 7 (8.6%) | 12 (6.3%) | 12 (6.6%) | 8 (9.0%) | 13 (6.2%) | 17 (7.2%) | ||
| Severe | 2 (25.0%) | 1 (4.8%) | 5 (9.3%) | 9 (11.1%) | 13 (6.8%) | 11 (6.0%) | 11 (12.4%) | 14 (6.6%) | 16 (6.8%) | ||
Data are number of infants (% survivors assessed).
Mann-Whitney U test for disability in 1979-80 vs 1985-87, z = 3.1, P < 0.01; 1979-80 vs 1991-92, z = 3.0, P < 0.01; 1985-87 vs 1991-92, z = 0.1, not significant (NS).
Mann-Whitney U test for disability in subgroup 500-749 gvs subgroup 750-999 g, 1979-80, z = 2.24, P = 0.025; 1985-87, z = −1.4, NS; 1991-92, z = 1.84, NS.