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Table 1 Socio-demographic data for the study population

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

  Index group Control group  
N % N % P-value
Index vs. Control
Age (mean/SD)** 30.6/6.09 30.3/5.16 0.602
Marital status*      0.989
 Married/Cohabiting 133 92.4 150 93.2  
 Single 11 5.6 11 6.8  
Sick leave at registration*      0.014
 Yes 9 7.0 2 1.3  
 No 120 93.0 156 98.7  
Socioeconomic group*      0.132
 Higher education 41 33.6 63 40.1  
 Lower education 47 38.5 52 33.1  
 Unemployed/parental leave 21 17.2 16 10.2  
 Student 13 10.7 26 16.6  
BMI in the beginning of pregnancy*      0.540
 −24.9 60 45.8 80 50.6  
 25–29.9 46 35.1 55 34.8  
 30- 25 19.1 23 14.5  
Tobacco use*      0.007
 Yes 30 22.6 17 10.7  
 No 103 77.4 142 89.3  
Parity*      0.085
 0 78 49.1 84 50.3  
 1 43 27.0 58 34.7  
 2 or more 38 23.9 25 15.0  
  1. *P-value for Students t-test
  2. **P-value for Pearson’s x2-test