The frequency of breech presentation by gestational age at birth: a large population-based study.
From a study of birth records, breech presentation at delivery for each gestational age was found to be less frequent as compared with other reports about antenatal ultrasonographic examination. Selection bias or the effect of labor may account for the observed difference.
Hickok
D E
DE
Division of Perinatal Medicine, Swedish Hospital Medical Center, Seattle, WA 98104.
Gordon
D C
DC
Milberg
J A
JA
Williams
M A
MA
Daling
J R
JR
D001719:Birth Certificates; D001946:Breech Presentation; D005260:Female; D005865:Gestational Age; D006801:Humans; D007743:Labor, Obstetric; D011247:Pregnancy; D016216:Ultrasonography, Prenatal