Determinants of adverse birth outcome in the west shewa zone, Oromia, regional state, Ethiopia: Unmatched case-control study.

Residence, lack of family support during childbearing, pregnancy type, short inter-pregnancy interval, having current obstetric complications, and number of ANC visits were identified as determinants of adverse birth outcome. Therefore, improving family support, increasing inter-pregnancy interval through family planning counselling and provision, and having the recommended ANC follow-up were recommended.