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Table 2 Distribution of cases and controls according to socio-economic background

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

Variables Cases (no.) Controls (no.) OR 95% CI P value
1. Frequency of meat consumption
occasional moderate-high 121 79 64 136 3.62 2.16–4.92 <0.001
2. Manual work
heavy usual 140 60 91 109 2.80 1.86–4.23 <0.001
3. Socio-economic status
low 165 129 2.60 1.63–4.15 <0.001
moderate-high 35 71    
4. Occupation
housewife 198 196 2.02 0.37–11.16 N.S
worker 2 4    
5. Level of education
illiterate 128 80 2.67 1.78–4.00 <0.001
6 years 65 103 0.45 0.30–0.68 <0.001
>6 years 7 17 1.00 - -
6. Presence of domestic animal
present 60 16 4.93 2.72–8.93 <0.001
absent 140 184    
7. Housing
inadequate 17 10 1.77 0.79–3.97 NS
adequate 183 190