Exogenous female sex steroid hormones and new-onset asthma in women: a matched case–control study
BackgroundEvidence on the role of exogenous female sex steroid hormones in asthma development in women remains conflicting. We sought to quantify the potential causal role of hormonal contraceptives and menopausal hormone therapy (MHT) in the development of asthma in women.MethodsWe conducted a matched case–control study based on the West Sweden Asthma Study, nested in a representative cohort of 1