Table 4. Agreement of asthma cases and non-cases classified by self-report (current asthma), the Danish National Patient Register (DNPR) and the Register of Medicinal Product Statistics (RMPS), excluding the first three years of age from the register data.

	Agreement among cases	Agreement among non-cases	Kappa
Self-report/DNPR	57%	91%	0.29
DNPR/Self-report	25%	98%	0.29
Self-report/RMPS	38%	93%	0.35
RMPS/Self-report	51%	89%	0.35
RMPS/DNPR	57%	93%	0.21
DNPR/RMPS	15%	99%	0.21