Validity and completeness of rheumatoid arthritis diagnoses in the nationwide DANBIO clinical register and the Danish National Patient Registry

Figures & data

Figure 1 Results from data retrieval and merged data between the Nationwide Clinical Register for Patients with Rheumatoid Arthritis (DANBIO) and the Danish National Patient Registry (DNPR), as well as from medical file review; n (%), positive predictive values (PPV), and registry completeness of relevant RA cases.

Table 1 Distribution of diagnoses from patient records of non-RA patients in the Nationwide Clinical Register for Patients with Rheumatoid Arthritis (DANBIO) and the Danish National Patient Registry (DNPR), (n)

Diagnosis	DANBIO only	Both in DANBIO and DNPR	DNPR only
Arthralgia	2	5	36
Crystal arthropathy	0	0	16
Psoriatic arthritis	0	1	34
Osteoarthritis/spondyloarthritis	1	3	39
Spondyloarthropathy	0	0	11
Juvenile arthritis	0	0	7
Polymyalgia	1	0	16
Reactive arthritis	0	0	13
Oligo/polyarthritis	5	1	20
Soft tissue rheumatism	0	0	5
Connective tissue diseases	1	0	10
Palindromic arthritis	0	0	7
Other	3	0	23
Missing	14	1	25
Total	27	11	262