Conclusion
Based on identical methods, the incidence of asthma among adults was stable from 1996 to 2016 and at almost identical level since the 1980s. The observed high incidence in parallel with low remission in adulthood is one explanation for the ongoing increase in prevalence of asthma among adults. As previously found, the incidence was higher among women than men and allergic rhino-conjunctivitis was the main risk factor.