Obstetrics and Gynecology · 2001 · 19 citations · 0 references
MedicineMaternal HealthObstetricsPerinatal EpidemiologyPreterm BirthReproductive HealthPregnancyPrenatal CarePrenatal Risk AssessmentPreterm Birth EpidemiologyReproductive RiskRisk Factors For Preterm BirthConditional Odds Ratio EstimationLate Preterm BirthPregnancy Loss RiskPreterm Birth Risk AnalysisPreterm Birth Risk ReductionPreterm Delivery Risk AssessmentPreterm Labor RiskSexual Activity