Parity and decreased use of oral contraceptives as predictors of asthma in young women

Clinical and Experimental Allergy : Journal of the British Society for Allergy and Clinical Immunology
M A JenkinsJohn L Hopper

Abstract

Asthma is more prevalent among males in childhood, but females report higher rates in adulthood. The reasons are unknown; although it has been hypothesized that hormonal factors may explain this sex-dependent risk of adult-onset asthma. To determine whether a woman's reproductive history or use of oral contraceptives is associated with adult-onset asthma. In 1991-1993, we surveyed 681 women aged 29-32 years randomly sampled from participants first surveyed at age 7 years by the 1968 Tasmanian Asthma Survey, a study of all children born in 1961 and attending school. Current asthma was defined as reporting asthma or wheezy breathing in the past 12 months. In women who did not have asthma or wheezy breathing by age 7 years, 13% had current asthma. The risk of current asthma in these who were parous increased with the number of births (odds ratio (OR) 1.50 per birth, 95% confidence interval (CI) 1.01-2.23 P=0.04) while women with one birth were at a lower risk than nulliparous women (OR 0.46 95% CI 0.2-1.06, P=0.07). Independent of parity, the risk decreased by 7% (95% CI 0-13%) per year of oral contraceptive pill use in all women. In women who did have asthma or wheezy breathing by age 7 years, neither reproductive history nor ora...Continue Reading

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Related Concepts

Asthma
Oral Contraceptives, Phasic
Illiteracy
Primiparity
Wheezing
Cigar smoker

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