Neurosensory impairment and disability rates at 2 years of age in ELBW survivors assessed in each era
| 1979–1980 | 1985–1987 | 1991–1992 | 1997 | 2005 | χ2linear trend | p value | |
|---|---|---|---|---|---|---|---|
| Assessed (n) | 89 | 212 | 237 | 168 | 165 | ||
| Impairments | |||||||
| Cerebral palsy | 13.5 (12) | 6.6 (14) | 9.3 (22) | 10.7 (18) | 7.3 (12) | 0.28 | 0.59, NS |
| Blindness | 6.7 (6) | 4.2 (9) | 2.1 (5) | 2.4 (4) | 0 (0) | 10.8 | 0.001 |
| Deafness | 4.5 (4) | 0.5 (1) | 0.8 (2) | 1.8 (3) | 2.4 (4) | 0.00 | 0.95, NS |
| DQ scores | |||||||
| ≥−1 SD | 47.2 (42) | 122 (57.5) | 137 (57.8) | 89 (53.0) | 86 (52.1) | 0.05 | 0.83, NS* |
| −2 SD, <−1 SD | 32.6 (29) | 25.9 (55) | 24.5 (58) | 25.0 (42) | 32.7 (54) | ||
| −3 SD, <−2 SD | 10.1 (9) | 9.0 (19) | 10.1 (24) | 8.3 (14) | 11.5 (19) | ||
| <−3 SD | 10.1 (9) | 7.5 (16) | 7.6 (18) | 13.7 (23) | 3.6 (6) | 0.60 | 0.44, NS† |
| Disabilities | |||||||
| None | 39.3 (35) | 55.2 (117) | 55.3 (131) | 51.2 (86) | 51.5 (85) | 1.57 | 0.21, NS‡ |
| Mild | 32.6 (29) | 26.4 (56) | 25.7 (61) | 22.6 (38) | 30.9 (51) | ||
| Moderate | 13.4 (12) | 10.4 (22) | 11.0 (26) | 12.5 (21) | 13.9 (23) | ||
| Severe | 14.6 (13) | 8.0 (17) | 8.0 (19) | 13.7 (23) | 3.6 (6) | 2.77 | 0.10, NS§ |
Data are % (n).
↵* Comparing no developmental delay with no developmental delay over successive eras.
↵† Comparing severe developmental delay with no severe developmental delay over successive eras.
↵‡ Comparing no disability with any disability over successive eras.
↵§ Comparing severe disability with no severe disability over successive eras.
DQ, developmental quotient.