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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 - - -