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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