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 |