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Table 3 Multivariate logistic regression analysis of variables associated with CS

From: Utilization of antenatal ultrasound scan and implications for caesarean section: a cross-sectional study in rural Eastern China

Variables Crude OR Adjusted OR 1 Adjusted OR 2 Adjusted OR 3
Antenatal ultrasound scans (frequencies)*& 1.342 (1.265-1.423) 1.346 (1.267-1.429) 1.323 (1.247-1.404) 1.319 (1.241-1.401)
Maternal education level (years)* - - -  
Husband education level (years)* - 1.058(1.018-1.099) - 1.059(1.019-1.101)
Maternal age (24-31 y as control)     
≤ 23 y - 0.790(0.643-0.971) - 0.766(0.641-0.943)
≥ 32 y - 1.294(1.049-1.595) - 1.441(1.129-1.840)
Family annual income (≤ 3000 yuan as control)     
3001-7499 yuan. - 1.225(1.008-1.487) -  
≥ 7500 yuan - 1.294(1.008-1.661) -  
Antenatal care# (No as control)     
Yes - -   
Pregnancy complications (No as control)     
Yes - - 1.449(1.177-1.783) 1.423(1.154-1.754)
Previous adverse pregnant outcomes (No as control)     
Yes - - 1.584(1.107-2.211) 1.584(1.117-2.246)
Primiparity (No as control)     
Yes - -   1.362(1.079-1.718)
  1. Crude OR: only antenatal ultrasound scans as the independent variable
  2. Adjusted OR1: adjusted for socio-demographic variables, including maternal and husband education level, maternal age and family annual income
  3. Adjusted OR2: adjusted for clinical variables, including antenatal care, pregnancy complications, previous adverse pregnant outcomes and primiparity
  4. Adjusted OR3: adjusted for both socio-demographic and clinical variables, including maternal and husband education level, maternal age, family annual income, antenatal care, pregnancy complications, previous adverse pregnant outcomes and primiparity
  5. * continuous variables
  6. # Antenatal care refers to antenatal check-up during the 1st trimester of pregnancy plus 4 times during 2nd and 3 rd trimesters, ie, at least 5 antenatal visits during pregnancy
  7. &Antenatal ultrasound scans means the frequencies that women had ultrasound scans during the index pregnancy