Maternal factors associated with prematurity in public maternity hospitals at the Brazilian Western Amazon.

Objective: To analyse maternal factors associated with prematurity in public maternity hospitals.

Design: Retrospective unmatched case-control study on two public maternity hospitals in the State of Acre, Brazil.

Setting And Participants: A sample of 341 newborn infants of premature birth (< 37 weeks; case group) and 388 newborn infants of term delivery (≥ 37 weeks; control group).