Inclusion and exclusion criteria

KF Kenaw Derebe Fentaw
SF Setegn Muche Fenta
HB Hailegebrael Birhan Biresaw
SM Solomon Sisay Mulugeta
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Pregnant women of age 15–49 years and whose gestational age (duration of pregnancy in weeks) was known at first ANC visit were included in the study (event). In addition, women who did not access ANC throughout pregnancy and the duration of pregnancy were recorded at delivery, or termination of pregnancy recorded was also included as censored observation. However, women who had ANC visit but their gestational at ANC visits was unknown (unrecorded) were excluded from this study.

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