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Table 9 Description of overlap between the different reported disease outcomes. Percentage within row. The first row shows that 70% of those with asthma diagnosis had asthma symptoms, 20% of those with asthma diagnosis had COPD diagnosis, and 21% of those with asthma diagnosis had chronic bronchitis symptoms.

From: Traffic-related air pollution associated with prevalence of asthma and COPD/chronic bronchitis. A cross-sectional study in Southern Sweden

  Total n Asthma diagnosis n (%) Asthma symptoms n (%) COPD diagnosis n (%) Chronic b. Symptoms (n %)
Asthma diagnosis 686 - 483 (70%) 139 (20%) 145 (21%)
Asthma symptoms 1115 483 (43%) - 219 (20%) 277 (25%)
COPD diagnosis 415 139 (34%) 219 (53%) - 152 (37%)
Chronic bronchitis symptoms 635 145 (23%) 277 (44%) 152 (24%) -