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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)