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Table 1 Characteristics of study population

From: Early pregnancy peripheral blood gene expression and risk of preterm delivery: a nested case control study

Characteristics Preterm cases
(N = 14)
Term controls
(N = 16)
GA at delivery, weeks* 32.3 (2.1) 39.1 (0.8)
GA at blood collection, weeks* 16.5 (2.1) 15.8 (1.4)
Preterm delivery types   
   Spontaneous labor 4 (28.6) 0 (0.0)
   Preterm PROM 5 (35.7) 0 (0.0)
   Other medically indicated 5 (35.7) 0 (0.0)
Maternal Age, years* 33.0 (4.2) 33.1 (3.8)
   20-34 years 8 (57.1) 9 (56.3)
   35 and above years 6 (42.9) 7 (43.7)
Race   
   White 8 (57.1) 15 (93.7)
   African American 2 (14.3) 0 (0.0)
   Other 4 (28.6) 1 (6.3)
Pre-gestational BMI, kg/m 2* 29.6 (11.9) 23.8 (6.2)
Multiparous 6 (42.9) 9 (56.3)
Multigravida 10 (71.4) 12 (75.0)
Cesarean delivery 4 (28.6) 2 (12.5)
Smoked in pregnancy 2 (14.3) 1 (6.3)
Preeclampsia 4 (28.6) 0 (0.0)
Gestational diabetes 2 (14.3) 2 (12.5)
Diabetes mellitus 0 (0.0) 0 (0.0)
Chronic hypertension 4 (28.6) 1 (6.3)
Chorioamnionitis 1 (7.1) 2 (12.5)
Abruptio placenta 1 (7.1) 0 (0.0)
IUGR 0 (0.0) 0 (0.0)
Cervical insufficiency 1 (7.1) 0 (0.0)
  1. *Mean, otherwise n (%)
  2. Abbreviations: GA: gestational age, PROM: premature rupture of membrane, IUGR: intrauterine growth retardation, BMI: body mass index; kg/m2: kilogram/meter2