Table 2.

Person-level agreement between self-report in interview and drug use calculated from prescription register data with PRE2DUP modeling method in the GeMS Study

Drug class or drug name and ATC code	Interview as a standard			Register as standard		Kappa (95% CI)
	Number of users based on interview	Number of users in both	Proportion found in register data	Number of users based on register	Proportion found in the interview
Alimentary tract and metabolism
Proton pump inhibitors, A02BC	50	40	80%	50	80%	0.78 (0.69–0.87)
Antidiabetics, A10	63	61	97%	61	100%	0.98 (0.96–1.00)
Insulins, A10A	18	18	100%	18	100%	1.00 (1.00–1.00)
Oral antidiabetics, A10B	55	52	95%	52	100%	0.97 (0.93–1.00)
Blood and blood forming organs
Antithrombotic drugs, B01A	154	143	93%	149	96%	0.92 (0.89–0.96)
Cardiovascular system
Digitalis, C01A	37	35	95%	38	92%	0.93 (0.87–0.99)
Organic nitrates, C01DA	240	195	81%	199	98%	0.82 (0.77–0.87)
Diuretics, C03	196	182	93%	196	93%	0.89 (0.85–0.93)
Beta-blocking agents, C07	353	342	97%	350	98%	0.93 (0.90–0.96)
Calcium channel blockers, C08	164	153	93%	169	91%	0.89 (0.84–0.93)
Agents acting on the renin- angiotensin system, C09	227	223	98%	240	93%	0.92 (0.89–0.96)
Lipid-modifying agents, C10	214	204	95%	208	98%	0.95 (0.92–0.98)
Genitourinary system and sex hormones
Drugs for urinary incontinence, G04BD	20	15	75%	17	88%	0.81 (0.66–0.95)
Drugs for benign prostatic hypertrophy, G04C	47	46	98%	50	92%	0.94 (0.90–0.99)
Systemic hormonal preparations
Levothyroxine, H03AA01	60	56	93%	56	100%	0.96 (0.92–1.00)
Musculoskeletal system
NSAIDs, M01A	95	40	42%	64	63%	0.43 (0.32–0.53)
Allopurinol, M04AA01	34	30	88%	32	94%	0.90 (0.83–0.98)
Drugs for treatment of bone diseases/bisphosphonates, M05	62	57	92%	63	91%	0.90 (0.84–0.96)
Nervous system
Opioids, N02A	16	9	56%	10	90%	0.69 (0.48–0.89)
Paracetamol, N02BE01	214	30	14%	36	83%	0.15 (0.10–0.21)
Antipsychotics, N05A	34	30	88%	32	94%	0.90 (0.83–0.98)
Benzodiazepines and related drugs, N05BA, N05CD, N05CF	189	134	71%	150	89%	0.70 (0.64–0.77)
Antidepressants, N06A	70	53	76%	57	93%	0.81 (0.74–0.89)
Antidementia drugs, N06D	65	59	91%	59	100%	0.95 (0.90–0.99)
Respiratory system
Drugs for obstructive airway diseases, R03	68	55	81%	61	90%	0.83 (0.76–0.91)
Adrenergics, inhalations, R03A	55	35	64%	41	85%	0.71 (0.60–0.82)
Other drugs for obstructive airway diseases, inhalations, R03B	39	33	85%	37	89%	0.86 (0.77–0.95)
Sensory organs
Antiglaucoma preparations, S01E	44	43	98%	50	86%	0.91 (0.84–0.97)

Abbreviations: ATC, Anatomical Therapeutic Chemical; CI, confidence interval; NSAIDs, non-steroidal anti-inflammatory drugs.