Table 4

‚ÄÉRelative risk of having rheumatoid nodules in ever smokers compared with never smokers by duration of smoking, stratified for being rheumatoid factor positive or negative

Smoking yearsRF positive patients (74 male, 66 female)RF negative patients (32 male, 35 female)
Cases (n)Controls (n)OR95% CICases (n)Controls (n)OR95% CI
CI, confidence interval; OR, odds ratio; ref, reference; RF, rheumatoid factor.
04371.0 (ref)5231.0 (ref)
1 to 2512186.81.9 to 24.64121.20.2 to 5.9
26 to 35191710.93.2 to 37.3281.40.2 to 9.2
>3515188.52.4 to 30.23101.40.2 to 8.5
Total50901453