Table 1—

Maternal characteristics

17P treatmentControlP value
n5571,524
Maternal age (years)29 (16–44)30 (16–45)0.855
>37 years53 (9.5)125 (8.2)0.376
Tobacco use54 (9.7)87 (5.7)0.002
Married421 (75.6)1,190 (78.1)0.214
History of preterm delivery557 (100)1,524 (100)
Prepregnancy BMI26.2 ± 6.626.2 ± 6.70.791
Obese BMI140 (25.1)340 (22.3)0.178
Betamimetic tocolysis101 (18.1)375 (24.6)0.002
Gestational age at start of out-patient management (weeks)19.0 (16.0–26.9)21.6 (4.7–25.9)<0.001
  • Data are median (range), means ± SD, or n (%).