Rates (%) of problem behaviour, cognitive impairment, school achievement, and special education assistance in VLBW and CHDS cohorts
| Measure | VLBW cohort | CHDS cohort | p Value | Odds ratio (95% CI) | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
| <1000 g (n=77) | 1000–1499 g (n=221) | (n = 1092) | VLBW (<1000 g) vs CHDS | VLBW (1000–1499 g) vs CHDS | ||||||
| Behaviour problems: | ||||||||||
| Inattention/hyperactivity | 21.3 | 22.1 | 7.4 | <.0001 | 3.4 (1.9, 6.2) | 3.5 (2.4, 5.3) | ||||
| Conduct problems | 12.0 | 18.0 | 8.1 | <.0001 | 2.1 (0.7, 4.3) | 2.5 (1.6, 3.8) | ||||
| Anxiety/withdrawal | 25.3 | 17.9 | 7.1 | <.0001 | 4.4 (2.5, 7.8) | 2.9 (1.9, 4.3) | ||||
| Cognitive impairment: | ||||||||||
| WISC-R Total IQ <85 | 24.0 | 21.2 | 11.5 | <.0001 | 2.4 (1.4, 4.3) | 2.1 (1.4, 3.1) | ||||
| Below average school performance | ||||||||||
| Reading | 23.9 | 29.3 | 15.6 | <.0001 | 1.7 (1.0, 3.0) | 2.2 (1.6, 3.1) | ||||
| Written expression | 37.1 | 37.4 | 20.3 | <.0001 | 2.3 (1.4, 3.9) | 2.3 (1.7, 3.2) | ||||
| Spelling | 41.3 | 40.7 | 21.3 | <.0001 | 2.6 (1.6, 4.3) | 2.5 (1.9, 3.5) | ||||
| Mathematics | 37.5 | 37.0 | 15.9 | <.0001 | 3.2 (1.9, 5.2) | 3.1 (2.2, 4.3) | ||||
| Physical education | 32.9 | 24.3 | 9.2 | <.0001 | 4.9 (2.8, 8.3) | 3.2 (2.2, 4.6) | ||||
| Special education assistance | ||||||||||
| Enrolled in special school, class or unit | 6.5 | 5.9 | 1.1 | <.0001 | 6.3 (2.1, 18.2) | 5.6 (2.5, 12.5) | ||||
| Receiving any form of special education assistance | 26.7 | 22.9 | 9.4 | <.0001 | 3.5 (2.0, 6.1) | 2.9 (2.0, 4.2) | ||||