About 10% of our population has asthma and of these, 50% are on long term inhaled corticosteroids. While asthma is not known to cause diabetes and hence not a confounder for the association of ICS and DM, we shall therefore target at the adult Chinese asthma patients using ICS as our study subjects, and compare the risk of diabetes/IGT/hyperinsulinemia of this group of patients with that of the general population.