Table 5.
Odds ratios of any reported longstanding illness
| Gestation at birth (weeks) | |||||
|---|---|---|---|---|---|
| <32 | 32-33 | 34-36 | 37-38 | 39-41 | |
| Any longstanding illness | |||||
| At 3 years: | (n=162) | (n=158) | (n=850) | (n=2911) | (n=10 080) |
| No (%) | 45 (26.3) | 31 (19.8) | 158 (17.8) | 490 (16.8) | 1482 (15.1) |
| Unadjusted odds ratio (95% CI) | 2.1 (1.4 to 3.2) | 1.5 (0.8 to 2.5) | 1.2 (1.0 to 1.5) | 1.1 (1.0 to 1.3) | 1 |
| Adjusted* odds ratio (95% CI) | 2.0 (1.3 to 3.1) | 1.4 (0.8 to 2.4) | 1.2 (1.0 to 1.5) | 1.1 (1.0 to 1.3) | 1 |
| Adjusted* population attributable fraction—% (95% CI) | 0.9 ( 0.2 to 1.7 ) | 0.4 (−0.2 to 1.4) | 1.1 (−0.3 to 2.7) | 2.4 (−0.5 to 5.4) | – |
| 1.5 (−0.1 to 3.3 ) | |||||
| At 5 years: | (n=166) | (n=149) | (n=855) | (n=2851) | (n=9965) |
| No (%) | 59 (35.9) | 43 (30.6) | 219 (25.6) | 561 (19.8) | 1861 (18.4) |
| Unadjusted odds ratio (95% CI) | 2.6 (1.7 to 3.9) | 2.0 (1.4 to 3.0) | 1.6 (1.3 to 1.9) | 1.1 (1.0 to 1.2) | 1 |
| Adjusted* odds ratio (95% CI) | 2.4 (1.6 to 3.8) | 2.0 (1.3 to 2.9) | 1.5 (1.2 to 1.8) | 1.1 (1.0 to 1.2) | 1 |
| Adjusted* population attributable fraction—% (95% CI) | 1.2 (0.4 to 2.1 ) | 0.9 (0.2 to 1.7) | 2.6 (1.0 to 4.3) | 1.3 (−1.1 to 3.7) | – |
| 3.4 (1.6 to 5.3) | |||||
| Any longstanding illness limiting child’s activities | |||||
| At 3 years: | (n=162) | (n=158) | (n=850) | (n=2911) | (n=10 080) |
| No (%) | 21 (12.2) | 11 (8.1) | 46 (5.7) | 87 (2.8) | 270 (2.7) |
| Unadjusted odds ratio (95% CI) | 5.2 (2.9 to 9.1) | 3.3 (1.7 to 6.6) | 2.2 (1.6 to 3.1) | 1.0 (0.8 to 1.4) | 1 |
| Adjusted* odds ratio (95% CI) | 4.5 (2.5 to 8.2) | 3.4 (1.7 to 6.7) | 2.1 (1.4 to 2.9) | 1.0 (0.8 to 1.3) | 1 |
| Adjusted* population attributable fraction—% (95% CI) | 3.2 (1.2 to 5.6) | 2.1 (0.3 to 4.4) | 5.6 (2.0, to 9.9) | 0.2 (−4.5 to 5.8) | – |
| 7.7 (3.4 to12.6) | |||||
| At 5 years: | (n=166) | (n=149) | (n=855) | (n=2851) | (n=9965) |
| No (%) | 32 (18.6) | 21 (13.9) | 79 (8.7) | 198 (6.7) | 532 (5) |
| Unadjusted odds ratio (95% CI) | 4.4 (2.8 to 6.9) | 3.1 (1.8 to 5.4) | 1.8 (1.4 to 2.4) | 1.4 (1.1 to 1.7) | 1 |
| Adjusted* odds ratio (95% CI) | 3.9 (2.4 to 6.3) | 3.0 (1.7 to 5.2) | 1.7 (1.3 to 2.3) | 1.3 (1.1 to 1.6) | 1 |
| Adjusted* population attributable fraction—% (95% CI) | 2.7 (1.1 to 4.3) | 1.8 (0.4 to 3.5) | 3.6 (1.2 to 6.5) | 5.4 ( 0.7 to 10.5) | – |
| 5.4 (2.4 to 8.6) | |||||
All percentages and odds ratios are weighted with sampling and non-response weights.
*Adjusted for child’s age at interview, sex, and ethnicity; maternal age at birth, marital status, education, and occupation; whether child was mother’s firstborn; duration of breast feeding; and maternal smoking and alcohol intake during pregnancy.