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Incidence of rheumatoid arthritis in Finland during 1980-1990.
Ann Rheum Dis. 1996 Sep; 55(9):608-11.AR

Abstract

OBJECTIVE

To obtain information on the incidence of rheumatoid arthritis and on its recent trends in Finland.

METHODS

The study covered those subjects entitled to receive specially reimbursed medication for rheumatoid arthritis under the nationwide sickness insurance scheme in five out of 21 central hospital districts in Finland (population basis about one million adults) during three years: 1980, 1985, and 1990.

RESULTS

The annual incidence of rheumatoid arthritis in 1980 and 1985, satisfying the American Rheumatism Association 1987 classification criteria, was 39/100,000 of the population > or = 16 years of age. The combined incidence of rheumatoid factor (RF) positive arthritis and RF negative polyarthritis was 46/100,000. A decline of approximately 40% occurred in the number of RF negative rheumatoid arthritis cases in 1990 compared with the earlier years. The declining trend was statistically significant (P = 0.008).

CONCLUSION

The decline in incidence of RF negative rheumatoid arthritis in Finland may reflect changes in the environment specifically affecting the risk of RF negative disease.

Authors+Show Affiliations

Department of Medicine, Kuopio University Hospital, Finland.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

8882129

Citation

Kaipiainen-Seppänen, O, et al. "Incidence of Rheumatoid Arthritis in Finland During 1980-1990." Annals of the Rheumatic Diseases, vol. 55, no. 9, 1996, pp. 608-11.
Kaipiainen-Seppänen O, Aho K, Isomäki H, et al. Incidence of rheumatoid arthritis in Finland during 1980-1990. Ann Rheum Dis. 1996;55(9):608-11.
Kaipiainen-Seppänen, O., Aho, K., Isomäki, H., & Laakso, M. (1996). Incidence of rheumatoid arthritis in Finland during 1980-1990. Annals of the Rheumatic Diseases, 55(9), 608-11.
Kaipiainen-Seppänen O, et al. Incidence of Rheumatoid Arthritis in Finland During 1980-1990. Ann Rheum Dis. 1996;55(9):608-11. PubMed PMID: 8882129.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Incidence of rheumatoid arthritis in Finland during 1980-1990. AU - Kaipiainen-Seppänen,O, AU - Aho,K, AU - Isomäki,H, AU - Laakso,M, PY - 1996/9/1/pubmed PY - 1996/9/1/medline PY - 1996/9/1/entrez SP - 608 EP - 11 JF - Annals of the rheumatic diseases JO - Ann Rheum Dis VL - 55 IS - 9 N2 - OBJECTIVE: To obtain information on the incidence of rheumatoid arthritis and on its recent trends in Finland. METHODS: The study covered those subjects entitled to receive specially reimbursed medication for rheumatoid arthritis under the nationwide sickness insurance scheme in five out of 21 central hospital districts in Finland (population basis about one million adults) during three years: 1980, 1985, and 1990. RESULTS: The annual incidence of rheumatoid arthritis in 1980 and 1985, satisfying the American Rheumatism Association 1987 classification criteria, was 39/100,000 of the population > or = 16 years of age. The combined incidence of rheumatoid factor (RF) positive arthritis and RF negative polyarthritis was 46/100,000. A decline of approximately 40% occurred in the number of RF negative rheumatoid arthritis cases in 1990 compared with the earlier years. The declining trend was statistically significant (P = 0.008). CONCLUSION: The decline in incidence of RF negative rheumatoid arthritis in Finland may reflect changes in the environment specifically affecting the risk of RF negative disease. SN - 0003-4967 UR - https://www.unboundmedicine.com/medline/citation/8882129/Incidence_of_rheumatoid_arthritis_in_Finland_during_1980_1990_ L2 - https://ard.bmj.com/lookup/pmidlookup?view=long&pmid=8882129 DB - PRIME DP - Unbound Medicine ER -