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Table 5 Univariate and multivariable logistic regression analysis for undergoing Combined Ultrasound and Biochemical test (CUB) in relation to maternal age divided into two age groups and to specified background characteristics

From: Prenatal diagnosis in Sweden 2011 to 2013—a register-based study

  Maternal age <35 years Maternal age ≥35 years
Variable Crude OR CI 95% Adjusted OR a Adjusted CI 95% Crude OR CI 95% Adjusted ORa Adjusted CI 95%
Educational level
 Elementary school, high school 1   1   1   1  
 University level 2.03 1.98–2.07 1.79 1.75–1.83 1.86 1.79–1.93 1.53 1.47–1.61
Body mass index (kg/m2)
  < 25 1   1   1   1  
  ≥ 25 0.75 0.73–0.76 0.84 0.82–0.86 0.65 0.63–0.68 0.76 0.73–0.80
Main occupation
 Employed, student, parental leave 1   1   1   1  
 Unemployed, sick leave, other 0.51 0.49–0.53 0.70 0.67–0.74 0.46 0.44–0.49 0.64 0.59–0.70
Country of birth
 Sweden 1   1   1   1  
 Other 0.60 0.58–0.61 0.76 0.74–0.79 0.55 0.53–0.57 0.74 0.70–0.78
Smoking at first visit at antenatal care
 No 1   1   1   1  
 Yes 0.62 0.59–0.65 0.87 0.82–0.92 0.59 0.54–0.64 0.74 0.66–0.84
Self-rated health prior to pregnancy
 Very good and good 1   1   1   1  
 Poor and very poor 0.85 0.74–0.98 0.96 0.82–1.13 0.62 0.50–0.76 0.80 0.63–1.02
Counseling due to fear of childbirth
 No 1   1   1   1  
 Yes 1.41 1.36–1.46 1.38 1.32–1.45 1.40 1.32–1.48 1.27 1.18–1.28
Treatment of psychiatric disorder
 No 1   1   1   1  
 Yes 1.03 0.99–1.08 1.15 1.09–1.22 1.04 0.98–1.11 1.16 1.05–1.28
  1. aAdjusted for all other variables included in the analysis