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 |