Preterm Birth and Gestational Length in Four Race-Nativity Groups, Including Somali Americans.

Objective: To compare preterm birth rates and gestational length in four race-nativity groups including Somali Americans.

Methods: Using a retrospective cohort study design of Ohio birth certificates, we analyzed all singleton births between 2000 and 2015 from four groups of women categorized as U.S.

Development and Validation of an Algorithm to Determine Spontaneous versus Provider-Initiated Preterm Birth in US Vital Records.

Background: Determining whether initiation of preterm birth was spontaneous, or through labour induction or caesarean without labour or membrane rupture is critical in surveillance and aetiological research on preterm birth, although this information is not explicitly included on the US Birth Certificate. Algorithms combining several fields from birth certificates have been developed to infer the initiating event, but none has been validated against manual review of original obstetric records. Our objective was to develop a birth certificate-based algorithm to determine initiation of preterm birth and validate it by manual review of original records.