Table 3. Multivariable logistic regression analyses of the associations of the z-scores for the anthropometric measurement values at birth, as well as the associations of the maternal and neonatal characteristics with BPD or death before 36 weeks postmenstrual age in the whole population and in each gestational age group.
| Gestational age group | Variables | BPD or death odds ratio (95% confidence interval) |
P-value |
|---|---|---|---|
| Whole population 23+0–31+6 weeks (n = 4,266) |
Birth weight z-score* | 1.35 (1.20–1.52) | <0.001 |
| Length at birth z-score* | 1.25 (1.14–1.37) | <0.001 | |
| Gestational age | 1.70 (1.63–1.77) | <0.001 | |
| Male | 1.37 (1.19–1.58) | <0.001 | |
| Oligohydramnios | 1.22 (1.00–1.50) | 0.056 | |
| RDS | 1.90 (1.46–2.48) | <0.001 | |
| 23+0–25+6 weeks (n = 785) |
Length at birth z-score* | 1.57 (1.31–1.89) | <0.001 |
| Gestational age | 2.65 (2.01–3.49) | <0.001 | |
| Male | 1.48 (1.04–2.11) | 0.028 | |
| 26+0–28+6 weeks (n = 1,721) | Birth weight z-score* | 1.33 (1.13–1.56) | 0.001 |
| Length at birth z-score* | 1.24 (1.09–1.42) | 0.001 | |
| Gestational age | 1.65 (1.47–1.85) | <0.001 | |
| Male | 1.34 (1.09–1.63) | 0.004 | |
| 29+0–31+6 weeks (n = 1,760) | Birth weight z-score* | 1.38 (1.05–1.80) | 0.020 |
| Length at birth z-score* | 1.16 (0.99–1.36) | 0.070 | |
| Gestational age | 1.44 (1.22–1.70) | <0.001 | |
| Male | 1.33 (1.04–1.69) | 0.023 | |
| RDS | 2.38 (1.70–3.33) | <0.001 |
* Per 1-point decrease.