Table I.
Maternal and neonatal characteristics of infants seen in follow-up versus those lost to follow-up
| Seen in Follow-up N=3069 |
Lost to Follow-up N=288 |
P-valuea | |
|---|---|---|---|
| Maternal variables | |||
| Age of mother (mean(SD))- years | N=3068 28.32(6.21) |
27.04(5.80) | <0.01 |
| Antenatal steroids –n (%) | 2756/3065(89.9) | 259/287(90.2) | 0.86 |
| Complete-n (%) | 2098/2747(76.4) | 200/259(77.2) | 0.76 |
| Partial-n (%) | 649/2747(23.6) | 59/259(22.8) | 0.82 |
| Delivery mode: Vaginal- n (%) | 1076/3069(35.1) | 107/288(37.2) | 0.48 |
| Histological chorioamnionitis- n (%) | 1599/2739(58.4) | 152/255(59.6) | 0.70 |
| Hypertension/preeclampsia-n (%) | 676/3064(22.1) | 53/287(18.5) | 0.16 |
| Maternal education < high school n (%) | 462/2437(19.0) | 40/214(18.7) | 0.92 |
| Race: Black- n(%) |
1310/2977(44.0) | 120/282(42.6) | 0.64 |
| White- n(%) | 1502/2977(50.5) | 140/282(49.7) | 0.80 |
| Other- n(%) | 165/2977(5.5) | 22/282(7.80) | 0.12 |
| Neonatal Variables | |||
| Outborn-n (%) | 106/3069(3.5) | 8/288(2.8) | 0.54 |
| Gestational age –wks (mean(SD)) | 24.91(1.04) | 25.05(1.02) | 0.02 |
| Birth weight g (mean(SD) ) | 757.09(159.92) | 776.27(160.33) | 0.07 |
| Male -n (%) | 1554/3065(50.7) | 143/288(49.7) | 0.73 |
| Delivery room intubation-n (%) | 2420/3069(78.9) | 226/288(78.5) | 0.88 |
| Surfactant use-n (%) | 2784/3069(90.7) | 261/288(90.6) | 0.96 |
| Postnatal steroids- n (%) | 688/2808(24.5) | 56/264(21.2) | 0.23 |
| Intraventricular hemorrhage- n (%) | 490/3059(16.0) | 40/287(13.9) | 0.36 |
| Parenchymal Hemorrhage- n (%) | 254/3059(8.30) | 24/287(8.36) | 0.97 |
| Oxygen at 36 weeks- n (%) | 1921/3067(62.6) | 171/288(59.4) | 0.27 |
| Necrotizing enterocolitis > Stage 2- n (%) | 267/3069(8.70) | 24/288(8.33) | 0.83 |
| Late onset sepsis - n (%) | 805/3069(26.2) | 69/288(24.0) | 0.40 |
| Retinopathy of prematurity requiring therapy- n (%) | 425/3040(14.0) | 32/279(11.5) | 0.24 |
a
P-values obtained using chi-square test or Fisher’s exact test for categorical and Nonparametric Wilcoxon test for continuous outcomes.