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Table 3 Multivariate logistic regression model 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

Age(years)

 < 35

–

–

–

 ≥ 35

1.64

1.01–2.44

0.015

Ethnic

 Tork

–

–

–

 Lor

4.55

2.50–8.29

0.001

 Fars

4.07

2.72–6.09

0.001

 Kord

5.80

2.74–12.28

0.001

 Arab

1.71

0.50–5.80

0.484

 Balooch

9.72

3.07–30.78

0.001

 Torkaman

3.25

1.77–5.97

0.001

 Else

3.69

0.85–16.09

0.108

Regular Cycles of period

 Yes

–

–

–

 No

1.77

1.14–3.01

0.001

Gap pregnancy(years)

 Upper than 3

–

–

–

 Lower than 1

1.85

1.14–3.01

0.012

 1–3

0.81

0.60–1.11

0.198

 Primary pregnancy

1.43

1.08–1.88

0.011

Consanguineous marriage

 No

–

–

–

 Yes

1.32

1.04–1.67

0.019

Abortion history

 No

–

–

–

 Yes

1.57

1.08–2.27

0.016

Stillbirth history

 No

–

–

–

 Yes

3.92

2.76–5.57

0.001