Table 1.
Baseline characteristics, by tocolytic administration.
| Variable | Tocolysis N=233 |
No Tocolysis N=64 |
p-value |
|---|---|---|---|
| Mean maternal age at delivery (years) | 25.0 +/− 6.0 | 24.8 +/− 5.8 | 0.751 |
| White race (n, %) | 166 (71.2) | 45 (70.3) | 0.884 |
| Hispanic ethnicity (n, %) | 38 (16.3) | 11 (17.2) | 0.867 |
| Married (n, %) | 159 (68.2) | 47 (73.4) | 0.424 |
| Mean prepregnancy body mass index (kilograms/meter2) | 25.0 +/− 6.7 | 25.6 +/− 6.1 | 0.491 |
| Tobacco use during pregnancy (n, %) | 10 (4.3) | 2 (3.1) | 0.675 |
| Nulliparous (n, %) | 102 (43.8) | 20 (31.3) | 0.071 |
| One or more previous preterm deliveries (n, %) | 55 (23.6) | 20 (31.3) | 0.212 |
| Mean admission gestational age (weeks) | 28.4 +/− 2.6 | 29.0 +/− 2.7 | 0.128 |
| Median admission cervical dilation (centimeters, IQR) | 5 (4–5.5) | 6 (4.5–6.5) | <0.001 |
| Fetal malpresentation (n, %) | 56 (24.0) | 16 (25.0) | 0.873 |
| Preterm premature rupture of membranes occurred after admission but at least 24 hours prior to delivery (n, %) | 110 (47.2) | 37 (57.8) | 0.133 |
| Received one or more doses of antenatal corticosteroids (n, %) | 206 (88.4) | 36 (56.3) | <0.001 |
| Mother transferred from presenting hospital to another facility for higher level of care while pregnant | 46 (19.7) | 5 (7.8) | 0.025 |
Data are presented as n(%) unless otherwise noted.