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Table 3 Final adjusted multinomial multivariate analysis predicting mistimed and unwanted pregnancy. Birth in Brazil, 2011/2012

From: Factors associated with unintended pregnancy in Brazil: cross-sectional results from the Birth in Brazil National Survey, 2011/2012

Variables Mistimed (a) Unwanted (a)
OR 95 % CI OR 95 % CI
Maternal Age (years)
  < 20 1.89 1.68–2.14 2.42 2.10–2.79
 35 and over 0.43 0.37–0.51 0.75 0.64–0.88
 20 to 34 1   1  
Schooling level
  ≤ 7 years 0.72 0.63–0.83 1.04 0.89–1.21
 8 to 11 years 0.99 0.87–1.12 1.38 1.21–1.58
 12 or more years 1   1  
Skin color
 White 1   1  
 Black 1.10 0.91–1.32 1.34 1.16–1.56
 Brown 1.15 1.04–1.27 1.20 1.08–1.34
 Yellow 1.56 1.05–2.32 1.39 0.93–2.08
Marital status
 With partner 1   1  
 Without partner 2.32 1.99–2.71 4.86 4.12–5.74
Has paid work
 Yes 1   1  
 No 1.15 1.04–1.27 1.14 1.04–1.25
Alcohol use
 No 1   1  
 Yes, but with no alcoholism risk 1.12 0.90–1.39 1.21 0.96–1.53
 Yes, with alcoholism risk 1.25 1.04–1.50 1.36 1.17–1.58
Tobacco use
 No 1    
 Yes 0.87 0.73–1.04 1.23 1.06–1.43
Parity
 Primiparous 1    
 1 1.30 1.16–1.46 2.49 2.15–2.88
 2 1.55 1.34–1.80 6.96 5.81–8.33
 3 and more 2.01 1.63–2.47 14.00 11.29–17.35
Adverse obstetric outcomes in previous pregnancyb
 Neonatal death
  No 1   1  
  Yes 0.61 0.44–0.85 0.44 0.34–0.57
 Preterm birth (GA < 37 weeks)
  No 1   1  
  Yes 1.16 0.91–1.48 1.40 1.16–1.67
 Low birth weight (BW < 2500 g)
  No 1   1  
  Yes 0.92 0.74–1.14 1.14 0.97–1.35
 Maternal complicationsc
  No 1   1  
  Yes 0.99 0.84–1.17 1.19 1.02–1.40
  1. GA gestational age, BW birth weigh
  2. (a) Reference category: intended pregnancy
  3. bExcluding primiparous women
  4. cComplications in previous pregnancy (eclampsia, high blood pressure, uterine rupture or diabetes)