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Table 1 Maternal characteristics of the placental abruption cases and controls

From: Placental mitochondrial DNA content and placental abruption: a pilot study

Characteristics Study groups P-valueb
Placental abruption (N = 103) Comparison group (N = 102)
n % n %
Maternal age at delivery (years)a 27.0 ± 6.6   26.8 ± 5.8   0.89
Maternal age at delivery (years)
 <20 18 17.5 10 9.8 0.29
 20–34 71 68.9 78 76.5  
 ≥35 14 13.6 14 13.7  
Gravidity
 1 45 43.7 37 36.3 0.21
 2–3 40 38.8 52 51.0  
 ≥4 18 17.5 13 12.7  
Nulliparous 46 44.7 37 36.3 0.22
Maternal education ≤ high school 76 73.8 69 67.7 0.29
Single marital status 19 18.5 14 13.7 0.29
Employed during pregnancy 58 56.3 44 43.1 0.06
Received prenatal care 94 91.3 97 95.1 0.41
Did not take prenatal vitamins 11 10.7 14 13.7 0.53
Smoked during pregnancy 3 2.9 1 1.0 0.62
Alcohol consumption during pregnancy 9 8.7 0 0.0 0.003
Drug abuse during pregnancy 1 1.0 0 0.0
Chronic hypertension 3 2.9 1 1.0 0.42
Preeclampsia 11 10.7 4 3.9 0.11
Pre-pregnancy body mass index (kg/m2)a 23.5 ± 3.2   23.6 ± 3.5   0.84
 Lean (<18.5) 4 3.9 1 1.0 0.57
 Normal (18.5–24.9) 75 72.8 74 72.5  
 Overweight (25–29.9) 18 17.5 21 20.6  
 Obese (≥30.0) 6 5.8 6 5.9  
Gestational age at delivery 34.7 ± 4.3   39.1 ± 1.4   <0.001
Infant birthweight (g) 2388 ± 921   2835 ± 939   <0.001
Stillbirth 21 20.4 0 0.0 <0.001
  1. aMean ± standard deviation (SD)
  2. bP-value from Student’s t test for continuous variables and Chi square test/Fisher’s Exact test for categorical variables