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Arthritis Rheum. 1996 May;39(5):732-5.

Cigarette smoking increases the risk of rheumatoid arthritis. Results from a nationwide study of disease-discordant twins.

Author information

1
University of Manchester, UK.

Abstract

OBJECTIVE:

To test the hypothesis that cigarette smoking is associated with susceptibility to rheumatoid arthritis (RA) by comparing smoking history between twins with RA and their unaffected co-twins.

METHODS:

Interview questionnaires on smoking history were administered to 79 identical (monozygotic [MZ]) and 71 same-sex nonidentical (dizygotic, [DZ]) twin pairs who were discordant for RA, recruited from the Arthritis and Rheumatism Council Twin Study. Results were expressed as odds ratios (OR) with 95% confidence intervals (95% CI).

RESULTS:

Although most twin pairs were concordant for smoking history, there was a strong association between ever smoking and RA in the MZ pairs (OR 12.0, 95% CI 1.78-513), with a similar trend observed in the DZ pairs (OR 2.5, 95% CI 0.92-7.87).

CONCLUSION:

The discordance in cigarette smoking history for individuals who are at presumed identical genetic risk for RA supports other data suggesting the role of smoking in disease susceptibility.

PMID:
8639169
DOI:
10.1002/art.1780390504
[Indexed for MEDLINE]

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