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.

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%)

-

Lindgren et al. International Journal of Health Geographics 2009 8:2   doi:10.1186/1476-072X-8-2