title: Periconceptional smoking and male:female ratio of newborns.
abstract: We have analysed data collected on 1962 women who gave birth at 37 or more weeks of gestation to health infants (excluding those with a low birth weight and twins). In comparison with non-smoking parents, the odds ratio (OR) of being male was lower than unity for offsprings of both smoking parents, but no clear relationship however emerged between the risk of giving birth to a male, and the number of cigarettes smoked per day.
authors.affiliation: Istituto di Ricerche Farmacologiche Mario Negri, Milano, Italy. parazzini@marionegri.it
authors.forename: Fabio
authors.initials: F
authors.lastname: Parazzini
authors.forename: Liliane
authors.initials: L
authors.lastname: Chatenoud
authors.forename: Cristina
authors.initials: C
authors.lastname: Maffioletti
authors.forename: Francesca
authors.initials: F
authors.lastname: Chiaffarino
authors.forename: Donatella
authors.initials: D
authors.lastname: Caserta
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D007407:Interviews as Topic; D007558:Italy; D008297:Male; D010290:Parents; D012744:Sex Ratio; D012907:Smoking