Correction of Systematic Bias in Ultrasound Dating in Studies of Small-for-Gestational-Age Birth: An Example From the Iowa Health in Pregnancy Study
Harland K, Saftlas A, Wallis A, Yankowitz J, Triche E, Zimmerman M. Correction of Systematic Bias in Ultrasound Dating in Studies of Small-for-Gestational-Age Birth: An Example From the Iowa Health in Pregnancy Study. American Journal Of Epidemiology 2012, 176: 443-455. PMID: 22886591, PMCID: PMC3499119, DOI: 10.1093/aje/kws120.Peer-Reviewed Original ResearchConceptsLast menstrual periodUltrasound gestational ageGestational ageSGA birthEarly ultrasoundPreterm deliveryPopulation-based case-control studyFirst trimester vaginal bleedingFirst trimester prenatal careGestational age fetusesGestational-age birthsCase-control studyStandard guidelinesMultivariable linear regressionDifferent study populationsVaginal bleedingGestational durationSGA fetusesSGA subjectsPrenatal careMaternal ageMenstrual periodPregnancy StudyStudy populationUnadjusted models