Fig. 1From: Risk factors for severe adult-onset asthma: a multi-factor approachFlowchart of the study population. Asthmatic patients drawn from the Finnish Drug Reimbursement register were over 30Â years old. A total of 248 asthmatic patients were included in the longitudinal, population-based Mini Finland Health Survey. A total of 1400 asthmatic patients had recently (within 2Â years) been diagnosed with asthma. Asthma was defined as adult onset if the subject responded that the onset of asthma symptoms and/or the age of asthma diagnosis was age 16Â years or laterBack to article page