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.
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.
Authors: K Aho; M Heliövaara; P Knekt; A Reunanen; A Aromaa; A Leino; P Kurki; R Heikkilä; T Palosuo Journal: Ann Rheum Dis Date: 1997-06 Impact factor: 19.103
Authors: Ted R Mikuls; Harlan Sayles; Fang Yu; Tricia Levan; Karen A Gould; Geoffrey M Thiele; Doyt L Conn; Beth L Jonas; Leigh F Callahan; Edwin Smith; Richard Brasington; Larry W Moreland; Richard J Reynolds; S Louis Bridges Journal: Arthritis Rheum Date: 2010-12