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Regression model for having at least three medical office visits for asthma in the past 12 months
| Covariate | Prevalence ratio (95% CI) | P |
|---|---|---|
| Age at test, years | 0.99 (0.97–1.00) | 0.11 |
| Body mass index | 1.02 (0.99–1.06) | 0.22 |
| Type of work-exacerbated asthma case: 0=epidemiological, 1=clinical | 8.0 (3.6–18) | <0.0001 |
