Prevalence trends in respiratory symptoms and asthma in relation to smoking - two cross-sectional studies ten years apart among adults in northern Sweden

摘要: Background: Smoking is considered to be the single most important preventable risk factor for respiratory symptoms. Estimating prevalence of symptoms since they often precede a diagnosis an obstructive airway disease, which places major burden on society. The aim this study was estimate trends and asthma among Swedish adults, in relation smoking habits. A further proportion symptom attributable smoking. Methods: Data from two large-scale cross-sectional surveys adults performed northern Sweden 1996 2006 were analysed. Identical methods same questionnaire used both surveys. association between smoking, analysed with multiple logistic regression analyses. Changes expressed as odds ratios. Additionally, population risks estimated. Results: decreased significantly 2006. Longstanding cough 12.4 10.1%, sputum production 19.0 15.0%, chronic productive 7.3 6.2%, recurrent wheeze 13.4 12.0%. Any asthmatic remained unchanged. This parallels decrease 27.4 19.1%. In contrast, physician-diagnosed increased 9.4 11.6%. patterns similar after correction confounders. All highly associated attributed (PAR) ranged 9.8 25.5%. 2006, PAR highest (20.6%). Conclusions: conclusion, we found that symptoms, particular common bronchitis, Sweden, parallel during time-period. Up one fourth