TY - JOUR
T1 - The occurrence of psoriatic arthritis in Denmark
AU - Pedersen, O. B.V.
AU - Svendsen, A. J.
AU - Ejstrup, L.
AU - Skytthe, A.
AU - Junker, P.
PY - 2008/10/1
Y1 - 2008/10/1
N2 - Objective: To apply and compare different classification criteria on a representative nationwide sample of psoriatic arthritis (PsA) twins and to estimate the prevalence and incidence of PsA. Methods: The study comprised three Danish nationwide twin cohorts. In 1994 37 388 Danish twin individuals and in 2002 46 418 twin individuals received a questionnaire, including questions on rheumatic diseases. Twins reporting PsA and their co-twins were classified according to the Moll and Wright and CASPAR (ClASsification criteria for Psoriatic ARthritis) criteria based on interview, clinical examination and scrutiny of medical records. Results: 228 twin individuals reported PsA and 164 (72%) participated in clinical validation. By using the Moll and Wright and CASPAR criteria, 54 and 50 cases were diagnosed with PsA respectively. The positive predictive value of self-reported PsA was 31%. According to the Moll and Wright and CASPAR criteria the prevalence was 0.15% (95% Cl: 0.13%, 0.22%) and 0.14% (95% Cl: 0.11%, 0.19%) respectively. The annual incidence rate based on new self-reported cases in 2002 was 6/100 000 person-years (95% Cl: 3/100 000 person-years, 11/100 000 person-years). Conclusions: The positive predictive value of selfreported PsA was 31%. The prevalence and incidence figures of PsA were equivalent to the previously reported occurrence in population- and hospital-based studies.
AB - Objective: To apply and compare different classification criteria on a representative nationwide sample of psoriatic arthritis (PsA) twins and to estimate the prevalence and incidence of PsA. Methods: The study comprised three Danish nationwide twin cohorts. In 1994 37 388 Danish twin individuals and in 2002 46 418 twin individuals received a questionnaire, including questions on rheumatic diseases. Twins reporting PsA and their co-twins were classified according to the Moll and Wright and CASPAR (ClASsification criteria for Psoriatic ARthritis) criteria based on interview, clinical examination and scrutiny of medical records. Results: 228 twin individuals reported PsA and 164 (72%) participated in clinical validation. By using the Moll and Wright and CASPAR criteria, 54 and 50 cases were diagnosed with PsA respectively. The positive predictive value of self-reported PsA was 31%. According to the Moll and Wright and CASPAR criteria the prevalence was 0.15% (95% Cl: 0.13%, 0.22%) and 0.14% (95% Cl: 0.11%, 0.19%) respectively. The annual incidence rate based on new self-reported cases in 2002 was 6/100 000 person-years (95% Cl: 3/100 000 person-years, 11/100 000 person-years). Conclusions: The positive predictive value of selfreported PsA was 31%. The prevalence and incidence figures of PsA were equivalent to the previously reported occurrence in population- and hospital-based studies.
UR - http://www.scopus.com/inward/record.url?scp=53149109738&partnerID=8YFLogxK
U2 - 10.1136/ard.2007.082172
DO - 10.1136/ard.2007.082172
M3 - Article
C2 - 18208866
AN - SCOPUS:53149109738
SN - 0003-4967
VL - 67
SP - 1422
EP - 1426
JO - Annals of the Rheumatic Diseases
JF - Annals of the Rheumatic Diseases
IS - 10
ER -