Table 1. Identification of morbidity in the Danish National Patient Registry and the Danish National Prescription Registry.

Morbidity - outcome	ICD-8a	ICD-10b	ATCc
Cardiovascular diseases	344, 410, 427, 428, 430–438, 440–445 and 782	I1, I2, I5–I7, G4 and G8	_
Lung diseases	490–493 and 515–518	J4, J6, J8 and J9	RO3
Diabetes mellitus	249 and 250	E1	A10
Rheumatic diseases	135, 446, 712 and 734	O8, M0 and M3	_
Malignant diseases	140–163, 170–174, 180–199 and 200–207	C0–C9	_
Other diseasesd	290, 293, 530–534, 571, 573, 070, 456, 344, 403–404, 580–584, 590, 593, 753, 792, and 079	F0, G3, K2, K7, B1, G8, I1, N0–N1, Q6, and B2	_

a) International Classification of Diseases 8.

b) International Classification of Diseases 10.

c) Anatomical Therapeutic Chemical classification system.

d) Dementia, gastric ulcer, liver disease, liver failure, hemiplegia, kidney disease, and AIDS.