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Table 2 Univariate logistic regression of risk factors for preterm delivery

From: Assessing the risk factors before pregnancy of preterm births in Iran: a population-based case-control study

Parameter

OR

95% CI

P- value

Place of Residence

 Rural

–

–

–

 Urban

1.40

1.17–1.68

0.001

Level of Education

 Collegiate

–

–

–

 Illiterate

1.40

0.88–2.23

0.155

 Primary

1.28

0.93–1.76

0.122

 Guidance

0.76

0.55–1.06

0.110

 High school

0.99

0.73–1.33

0.973

Consanguineous marriage

 No

–

–

–

 Yes

1.16

0.95–1.41

0.126

Abortion history

 No

–

–

–

 Yes

1.92

1.46–2.51

0.001

Stillbirth history

 No

–

–

–

 Yes

3.63

2.74–4.80

0.001

Cesarean history

 No

–

–

–

 Yes

1.14

0.87–1.50

0.321

BMI

 Normal

–

–

–

 Underweight

1.23

0.96–1.57

0.097

 Overweight

1.12

0.87–1.44

0.350

 Obesity grade1

1.66

1.16–2.37

0.005

 Obesity grade 2

0.49

0.19–1.28

0.146

Age(years)

 < 35

–

–

–

 ≥ 35

1.96

1.44–2.68

0.001

Ethnic

 Tork

–

–

–

 Lor

4.88

2.90–8.19

0.001

 Fars

4.26

2.99–6.05

0.001

 Kord

7.63

4.02–14.50

0.001

 Arab

2.88

1.09–7.63

0.389

 Balooch

5.24

1.84–15.0

0.001

 Torkaman

3.11

1.85–5.23

0.001

 Else

3.21

0.83–12.36

0.081

Regular Cycles of period

 Yes

–

–

–

 No

1.92

1.48–2.48

0.001

Gap pregnancy(years)

 Upper than 3

–

–

–

 Lower than 1

2.11

1.43–3.10

0.001

 1–3

0.87

0.68–1.12

0.293

 Primary pregnancy

1.10

0.88–1.37

0.374