Table 4. Results of stage-wise regression analysis predictors of weight z-scores at 20 months corrected age.
| Variable | Stage I | Stage II | Stage III | Stage IV | ||||
|---|---|---|---|---|---|---|---|---|
| B | (95% CI) | B | (95% CI) | B | (95% CI) | B | (95% CI) | |
| Time period (I vs II) | 0.35 | (−0.02,0.72) | 0.32 | (−0.11,0.76) | 0.48 | (0.04,0.93)* | 0.45 | (0.01,0.89)* |
| Sociodemographic status | ||||||||
| Maternal education <high school | 0.26 | (−0.23,0.75) | 0.31 | (−0.18,0.80) | 0.22 | (−0.26,0.70) | 0.22 | (−0.26,0.69) |
| Race | 0.11 | (−0.27,0.49) | 0.12 | (−0.26,0.50) | 0.18 | (−0.19,0.56) | 0.20 | (−0.17,0.57) |
| Sex of child | −0.12 | (−0.48,0.25) | −0.12 | (−0.48,0.25) | −0.12 | (−0.48,0.24) | −0.10 | (−0.46,0.25) |
| Multiple birth | −0.02 | (−0.51,0.47) | −0.10 | (−0.51,0.49) | −0.14 | (−0.63,0.35) | −0.10 | (−0.59,0.38) |
| Neonatal therapy | ||||||||
| Surfactant | −0.27 | (−0.97,0.43) | −0.22 | (−0.90,0.46) | −0.27 | (−0.94,0.40) | ||
| Postnatal steroids | −0.28 | (−0.70,0.14) | 0.02 | (−0.42,0.45) | 0.09 | (−0.35,0.52) | ||
| Indomethacin | −0.32 | (−0.75,0.11) | −0.29 | (−0.71,0.14) | −0.26 | (−0.68,0.15) | ||
| PDA ligation | 0.04 | (−0.38,0.45) | 0.14 | (−0.26,0.54) | 0.17 | (−0.23,0.57) | ||
| Neonatal morbidity | ||||||||
| Severity of lung diseasea | −0.01 | (−0.02,−0.003)** | −0.01 | (−0.02,−0.002)* | ||||
| Severely abnormal ultrasoundb | −0.60 | (−1.06,−0.13)* | −0.37 | (−0.86,0.13) | ||||
| Neurosensory outcome | ||||||||
| Neurosensory abnormality | −0.55 | (−1.01,−0.08)* | ||||||
| R2 | 0.03 | 0.06 | 0.12 | 0.14 | ||||
Abbreviations: B, unstandardized coefficient (95% CI); 95% CI, 95% confidence interval; PDA, patent ductus arteriosus.
a
Days on ventilator
b
Includes grades III–IV hemorrhage, periventricular leukomalacia and ventricular dilatation at discharge.
*P<0.05, **P<0.001.