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. 2018 Jun 27;13(6):e0199029. doi: 10.1371/journal.pone.0199029

Table 1. Sample characteristics (frequency or mean ± SD).

Total (n = 42) Term (n = 21) Preterm (n = 21)
Demographics
Age 26.25 ± 5.05 26.3 ± 4.8 26.2 ± 5.3
Pre-Pregnancy BMI 25.7 ± 5.35 25.8 ± 5.5 25.6 ± 5.2
Cotinine Positive 2 1 1
Pregnancy Outcomes
Spontaneous Delivery 42 21 21
Gestational Age at Birth (Weeks) 36.9 ± 1.6 38.6 ± 0.7 35.3 ± 2.4
Birthweight (g) 2852 ± 410.1 3114 ± 286.5 2590 ± 533.6
Infant Head Circumference (cm) 32.6±1.8 33.1±1.2 32.1±2.2
Preeclampsia 0 0 0
Chorioamnionitis 0 0 0
Preterm PROM 0 0 0
Diabetes (GDM or PGDM) 0 0 0
Placental Abruption 0 0 0
Maternal History
Gravida
    1 Pregnancy 7 3 4
    2 Pregnancies 7 3 4
    3 Pregnancies 16 10 6
    4+ Pregnancies 12 5 7
History of PTB 10 3 7
    Progesterone Treatment 0 0 0