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Table 2 Unadjusted associations between study variables and 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

Variable Mistimed (a) Unwanted (a)
OR 95 % CI OR 95 % CI
Sociodemographic variables
 Maternal age (years)
   < 20 1.76 1.57–1.98 1.48 1.32–1.67
  35 and over 0.45 0.39–0.52 1.09 0.97–1.24
  20 to 34 1 - 1 -
 Schooling level
   ≤ 7 years 1.21 1.05–1.39 3.37 2.94–3.88
  8 to 11 years 1.32 1.16–1.50 2.29 2.01–2.62
  12 or more years 1   1  
 Skin color
  White 1 - 1 -
  Black 1.19 1.00–1.42 1.75 1.49–2.06
  Brown 1.26 1.15–1.40 1.49 1.35–1.65
  Yellow 1.66 1.14–2.42 1.67 1.18–2.32
Individual variables
 Marital status
  With partner 1 - 1 -
  Without partner 2.42 2.04–2.87 4.17 3.59–4.85
 Has paid work
  Yes 1 - 1 -
  No 1.39 1.26–1.53 1.60 1.46–1.75
 Alcohol use
  No 1 - 1 -
  Yes, but with no alcoholism risk 1.04 0.83–1.31 1.22 0.98–1.52
  Yes, with alcoholism risk 1.40 1.17–1.67 1.87 1.64–2.14
 Tobacco use
  No 1 - 1 -
  Yes 1.01 0.86–1.18 2.26 1.98–2.57
 Parity
  Primiparous 1 - 1 -
  1 0.97 0.87–1.09 1.59 1.41–1.80
  2 1.02 0.88–1.16 3.92 3.34–4.60
  3 or more 1.16 0.96–1.40 7.51 6.35–8.88
Adverse obstetric outcomes in previous pregnancyb
 Neonatal death
  No 1   1  
  Yes 0.61 0.46–0.81 0.61 0.48–0.76
 Stillbirth
  No 1   1  
  Yes 0.86 0.63–1.16 0.90 0.69–1.17
 Preterm birth (GA < 37 weeks)
  No 1   1  
  Yes 1.05 0.80–1.29 1.44 1.23–1.69
 Low birth weight (BW < 2500 g)
  No 1   1  
  Yes 0.95 0.80–1.14 1.37 1.18–1.59
 Maternal complicationsb
  No 1   1  
  Yes 0.95 0.81–1.12 1.22 1.04–1.42
  1. GA gestational age, BW birth weight
  2. (a) Reference category: intended pregnancy
  3. bExcluding primiparous women
  4. cComplications in previous pregnancy (eclampsia, high blood pressure, uterine rupture or diabetes)