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Table 3 Distribution of study population according to other suspected risk factors.

From: Risk factors for pre-term birth in Iraq: a case-control study

Variables Cases (no.) Controls (no.) OR 95% CI P value
Parity      
0–2 112 111 1.00 - -
3 23 24 0.95 0.52–1.75 NS
4 22 24 0.91 0.49–1.68 NS
5+ 43 41 1.06 0.65–1.72 NS
all categories 200 200 - - -
Risk variables of present pregnancy
cervical incompetence 47 18 3.11 1.73–5.58 <0.001
multiple pregnancy 19 3 6.89 2.00–23.69 <0.001
accidental hemorrhage 9 4 2.31 0.70–7.64 NS
genital tract infection 48 45 1.09 0.69–1.74 NS
Obstetric history
previous PTB 30 1 35.12 4.74–260.32 <0.001
abortion 3 1 3.03 0.31–29.38 NS
PPROM 14 10 1.43 0.62–3.30 NS
Medical disease
typhoid fever 16 7 2.40 0.97–5.97 NS
diabetes 2 1 2.01 0.18–22.35 NS
urinary tract infection 82 40 2.78 1.78–4.35 <0.001
Emotional disturbances
severe fright 67 63 1.10 0.72–1.67 NS
anxiety 87 60 1.80 1.19–2.72 <0. 01
antenatal visits due to pregnancy complications
0 25 30 1.00 - -
1–3 65 95 0.53 0.35–0.80 <0.001
≥4 110 75 2.04 1.37–3.04 <0.001
cigarette smoking
smokers 4 5 0.80 0.21–3.02 NS
long travel and trauma to abdomen
history of long travel 61 65 0.91 0.60–1.39 NS
trauma to abdomen 45 14 3.86 2.04–7.30 <0.001