Adjusted2-150 odds ratio (with 95% confidence interval (CI)) of rheumatoid factor (RF) positivity (sensitised sheep cell agglutination titre ⩾128) for different factors
Factor | Unit or category | Number of subjects examined | Number of RF positive cases | Odds ratio | 95% CI | p Value2-151 | |
Consumption of coffee | For each SD, 2.8 cups | 6809 | 69 | 1.24 | 0.97 to 1.58 | 0.09 | |
Age | For each SD, 14.1 years | 6809 | 69 | 1.41 | 1.09 to 1.83 | 0.01 | |
Sex | Men | 3132 | 37 | 1.00 | |||
Women | 3677 | 32 | 1.31 | 0.75 to 2.28 | 0.34 | ||
Serum LDL cholesterol2-152 | For each SD, 1.2 mmol/l | 6809 | 69 | 1.28 | 1.04 to 1.59 | 0.03 | |
Smoking | Never smoked | 3789 | 21 | 1.00 | |||
Quit | 1414 | 18 | 2.78 | 1.36 to 5.69 | |||
Cigars, pipe or | 0.0003 | ||||||
<20 Cigarettes/day | 1004 | 20 | 4.32 | 2.19 to 8.54 | |||
⩾20 Cigarettes/day | 602 | 10 | 3.77 | 1.57 to 9.04 |