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In a large population-based study of British adults aged 40 to 69 years, an increased serum level of free testosterone was associated with lower odds of physician-diagnosed asthma and current wheeze both in women and men, and associated with lower odds of at least one asthma hospitalization in women. Higher serum free testosterone levels were also associated with higher lung function in men. The findings from this study suggest that serum-free testosterone is linked to lower risk of asthma in both men and women.