Additional file 1 of Change in the symptom profile treated as asthma – two cross-sectional studies twenty years apart

Additional file 1: Table S1. Crude and age- and sex-standardised prevalence’s (%) of respiratory symptoms in ECRHS I and SOHOS study using 1993-year annual population data from Tartu, Estonia. Table S2. Difference in prevalence (%) of respiratory symptoms for early (<4 weeks) and late (>8 weeks) questionnaire respondents. Table S3. Prevalence (%) of respiratory symptoms, attack of asthma and asthma medication use in women, men among non-smokers. *p < 0.05 from Chi-square test.