|Variables||Study group (%)||Control group (%)||Odds ratio (95% CI)|
|Gestational age ≤36 weeks||9.5||1.6||13.2 (2.7 to 64.6)|
|Jaundice in nursery||90.6||55.9||7.8 (3.4 to 18.0)|
|Gestational age >36–37 weeks||16.5||4.7||7.7 (2.7 to 22.0)|
|Gestational age >37–38 weeks||28.4||8.7||7.2 (3.1 to 17.0)|
|Breast feeding||89.0||63.8||4.2 (1.8 to 9.9)|
|Length of stay 48–<72 hours||44.1||33.1||3.2 (1.4 to 7.1)|
|Male sex||74.8||49.6||2.9 (1.5 to 5.7)|
|Length of stay <48 hours||47.2||46.5||2.4 (1.1 to 5.3)|
|Gestational age ≥40 weeks||15.8||34.7||0.4 (0.2 to 0.7)|
|Initial length of stay ≥72 hours||8.7||20.5||0.4 (0.2 to 0.8)|
|No meconium||3.2||22.8||0.2 (0.04 to 0.6)|
|Rupture of membranes ≥18 hours before birth||1.6||7.1||0.08 (0.01 to 0.5)|
Infant readmission was related to early discharge, young gestational age, and breast feeding
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