title: Associations of parity, breast-feeding, and birth control pills with lumbar spine and femoral neck bone densities.
abstract: The relationships between parity, breast-feeding, and the use of birth control pills and the bone densities of the lumbar spine and the femoral neck, measured by dual-photon densitometry, were studied in normal women. Femoral neck density was found to decrease by 1.1% per live-birth, whereas lumbar spine density showed no significant association with parity. Breast-feeding was found to increase lumbar spine density by 1.5% per breast-fed child, whereas femoral neck density was not significantly correlated. No significant relationships between the use of birth control pills and the bone densities were found.
authors.affiliation: Department of Gynecology and Obstetrics, School of Medicine and Biomedical Sciences, State University of New York, Buffalo 14214.
authors.forename: M M
authors.initials: MM
authors.lastname: Hreshchyshyn
authors.forename: A
authors.initials: A
authors.lastname: Hopkins
authors.forename: S
authors.initials: S
authors.lastname: Zylstra
authors.forename: M
authors.initials: M
authors.lastname: Anbar
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001942:Breast Feeding; D003276:Contraceptives, Oral / Q000008:administration & dosage*; D003720:Densitometry / Q000379:methods; D005260:Female; D005272:Femur Neck / Q000033:anatomy & histology*; D006801:Humans; D008159:Lumbar Vertebrae / Q000033:anatomy & histology*; D008875:Middle Aged; D008903:Minerals; D010298:Parity; D013997:Time Factors
chemical_list: D003276:Contraceptives, Oral; D008903:Minerals