Table 4
Linear regression analysis for cumulative entrance skin dose in neonates.
| Univariable | Multivariable | |||
|---|---|---|---|---|
| Variable | B (95% CI) | p-value | B (95% CI) | p-value |
| Birth weight (g) | ||||
| ≤ 750 | 0.00 (Reference) | 0.00 (Reference) | ||
| 751 to ≤ 1000 | −0.59 (−0.96, 0.22) | 0.002 | −0.3 (−0.63, 0.04) | 0.081 |
| 1001 to ≤ 1250 | −1.11 (−1.45,−0.76) | < 0.001 | −0.31 (−0.67, 0.05) | 0.095 |
| 1251 to ≤ 1500 | −1.58 (−1.92,−1.25) | < 0.001 | −0.5 (−0.88,−0.11) | 0.011 |
| Male | 0.16 (−0.06, 0.38) | 0.15 | ||
| Gestational age (weeks) | −0.22 (−0.26, −0.19) | < 0.001 | ||
| Delivery by C-section | 0.05 (−0.26, 0.36) | 0.756 | ||
| Apgar score at 1 minute | −0.14 (−0.19, −0.08) | < 0.001 | 0.03 (−0.02, 0.07) | 0.237 |
| Apgar score at 5 minutes | −0.2 (−0.28, −0.13) | < 0.001 | ||
| RDS | 0.94 (0.72, 1.16) | < 0.001 | 0.44 (0.24, 0.65) | < 0.001 |
| PDA | 0.6 (0.39, 0.8) | < 0.001 | ||
| BPD | 1.05 (0.88, 1.23) | < 0.001 | ||
| BPD severity | ||||
| Normal | 0.00 (Reference) | 0.00 (Reference) | ||
| Mild | 0.85 (0.67, 1.04) | < 0.001 | 0.5 (0.27, 0.72) | < 0.001 |
| Moderate | 1.43 (1.15, 1.71) | < 0.001 | 0.8 (0.45, 1.14) | < 0.001 |
| Severe | 1.71 (1.26, 2.16) | < 0.001 | 0.91 (0.39, 1.43) | 0.001 |
| EONS | 0.79 (−0.38, 1.96) | 0.182 | ||
| LONS | 0.79 (0.46, 1.11) | < 0.001 | ||
| NEC | 0.73 (0.46, 1) | < 0.001 | ||
| IVH | 0.79 (0.49, 1.09) | < 0.001 | ||
| ROP | 0.86 (0.64, 1.08) | < 0.001 | ||
| Pneumothorax | 0.75 (0.2, 1.3) | 0.008 | ||
| PVL | 0.21 (−0.54, 0.95) | 0.586 | ||
| Duration of ventilation (days) | 0.03 (0.03, 0.04) | < 0.001 | 0.01 (0, 0.02) | 0.008 |
| Duration of TPN (days) | 0.04 (0.03, 0.04) | < 0.001 | ||
| Duration of C- line (days) | 0.04 (0.03, 0.04) | < 0.001 | ||
The cumulative entrance skin dose (dependent variable) was log-transformed before linear regression analysis.
B: regression coefficient; CI: confidence interval; RDS: respiratory distress syndrome; PDA: patent ductus arteriosus; BPD: bronchopulmonary dysplasia; EONS: early-onset sepsis; LONS: late-onset sepsis; NEC: necrotizing enterocolitis; IVH: intraventricular hemorrhage; ROP: retinopathy of prematurity; PVL: periventricular leukomalacia; TPN: total parenteral nutrition.
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