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Table 3 Obstetric variables

From: Effect of maternal stress during pregnancy on the risk for preterm birth

  Index group Control group  
  N % N % P-value**
SSRI use during pregnancy      0.183
 Yes 10 7 5 3.1  
 No 132 93 156 96.9  
Twin pregnancy      <0.000
 Yes 24 15 0 0  
 No 136 85 165 100  
Amniotic fluid pathology      0.034
 Normal 132 91.7 157 98.1  
 Polyhydramnios 5 3.5 1 0.6  
 Oligohydramnios 7 4.9 2 1.3  
Genital tract infection      <0.000
 Yes 36 24.8 13 8.1  
 No 109 75.2 147 91.9  
Premature contractions      <0.000
 Yes 60 40.3 24 15  
 No 89 59.7 136 85  
Cervical changes      <0.000
 Yes 21 14.2 4 2.5  
 No 127 85.8 156 97.5  
Vaginal bleeding      <0.000
 Yes 59 40 15 9  
 No 89 60 144 91  
Anemia      0.601
 Yes 8 6 7 4  
 No 126 94 152 96  
PPROM      <0.000
 Yes 94 59.5 1 0.6  
 No 64 40.5 164 99.4  
SGA      <0.000
 Yes 24 15.3 4 2.4  
 No 133 84.7 165 97.6  
Congenital defects      0.279
 Yes 9 5.7 5 3  
 No 149 94.3 164 97  
Placental abruption      0.003
 Yes 8 5 0 0  
 No 151 95 168 100  
Preeclampsia      <0.000
 Yes 14 8.8 5 3  
 No 145 91.2 163 97  
Maternal stress during pregnancy      <0.000
 Yes 58 42.3 32 20  
 No 79 57.7 128 80  
Onset of labor      0.005
 Spontaneous 123 76.9 150 88.8  
 Induced 37 23.1 19 11.2  
Mode of delivery      <0.000
 Vaginal 98 61.6 143 84.6  
 Vacuum extraction 8 5 13 7.7  
 Cesarean section 53 33.3 13 7.7  
  Mean SD Mean SD p*
Gestational week at birth 33.06 3.84 40.03 1.2 <0.000
  1. *P-value for Students t-test
  2. **P-value for Pearson’s x2-test