Table 1 Distribution of study population by age.
From: Risk factors for pre-term birth in Iraq: a case-control study
Age groups (years) | Cases (no.) | Controls (no.) | OR | 95% CI | P value |
|---|---|---|---|---|---|
<19 | 41 | 10 | 4.90 | 2.38–10.09 | <0.001 |
20–29 | 90 | 102 | 1.00 | - | - |
30–34 | 37 | 48 | 0.72 | 0.45–1.17 | NS |
35–39 | 18 | 30 | 0.56 | 0.30–1.04 | NS |
≥40 | 14 | 10 | 1.43 | 0.62–3.30 | NS |
all ages | 200 | 200 | - | - | - |