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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