Figure 2. Adjusted relative risks and 95% confidence intervals of comorbidity, as indicated by health services use, among individuals age 18 to 44 years, 45 to 64 years and 65 years and older with compared to without asthma in 14 disease categories.

Solid black circles represent relative risks for individuals 18 to 44 years; solid grey circles represent relative risks for individuals 45 to 64 years; hollow circles represent relative risks for individuals age 65 years and older. All analyses were adjusted for age, sex, socioeconomic status, rural/urban place of residence, a co-diagnosis of COPD, and other comorbidity as indicated by ICD-9 category.