Final logistic regression model for chronic lung disease for 11 453 infants born in 1998–2001
| Predictor variable | Parameter estimate | Standard error | Adjusted OR (95% CI) |
|---|---|---|---|
| OR, Odds ratio; CI, confidence interval; BW for GA, birth weight for gestational age | |||
| Intercept | −3.4667 | 0.1008 | |
| Gestational age | |||
| 31 weeks | 0 | 1.00 reference group | |
| 30 weeks | 0.5972 | 0.1190 | 1.82 (1.44 to 2.29) |
| 29 weeks | 1.2996 | 0.1111 | 3.67 (2.95 to 4.56) |
| 28 weeks | 1.9475 | 0.1085 | 7.01 (5.67 to 8.67) |
| 27 weeks | 2.6616 | 0.1096 | 14.32 (11.55 to 17.75) |
| 26 weeks | 3.1625 | 0.1136 | 23.63 (18.91 to 29.53) |
| 25 weeks | 3.9639 | 0.1273 | 52.66 (41.04 to 67.58) |
| ⩽24 weeks | 4.6643 | 0.1467 | 106.1 (79.58 to 141.4) |
| BW for GA (centile grouping) | |||
| ⩾75th | −0.5285 | 0.0731 | 0.59 (0.51 to 0.68) |
| 25th−74th | 0 | 1.00 reference group | |
| 10th−24th | 0.6503 | 0.0734 | 1.92 (1.66 to 2.21) |
| 3rd−9th | 1.2133 | 0.0961 | 3.37 (2.79 to 4.06) |
| <3rd | 1.7351 | 0.1438 | 5.67 (4.28 to 7.52) |
| Sex | |||
| Female | 0 | 1.00 reference group | |
| Male | 0.4144 | 0.0539 | 1.51 (1.36 to 1.68) |