title: The use of survival analysis to quantitate days open: advantages and applications.
authors.forename: L A
authors.initials: LA
authors.lastname: Lee
authors.forename: J D
authors.initials: JD
authors.lastname: Ferguson
authors.forename: D T
authors.initials: DT
authors.lastname: Galligan
mesh_terms: D000818:Animals; D002417:Cattle / Q000502:physiology*; D005260:Female; D005298:Fertility; D012044:Regression Analysis