Table 1. 7-year prevalence of asthma according to self-report, the Danish National Patient Register and the Register of Medicinal Product Statistics.
Classification method | N cases/N non-cases | Prevalence % |
Self-reports | ||
‘Self-reported asthma’: diagnosis of asthma given by a doctor (n = 53,637) | 6,424/47,213 | 12.0% |
‘Self-reported current asthma’: doctor diagnosis + current wheezing (n = 19,146) | 2,244/16,902 | 11.7% |
Danish National Patient Register | ||
Hospital cases (n = 93,616) | 5,861/87,755 | 6.6% |
Register of Medicinal Product Statistics | ||
Prescription cases (n = 93,616) | 30,099/63,517 | 32.2% |
Combination of methods | ||
Self-reported asthma + hospital cases + prescription cases (n = 53,637) | 1,935/51,207 | 3.6% |