Table 4 Predictors of rheumatoid arthritis
Odds ratio (95% CI)
Breast feeding for 1-12 months vs 0 months0.62 (0.36 to 1.07)
Breast feeding for ⩾13 months vs 0 months0.40 (0.20 to 0.83)
Smoking*1.38 (0.83 to 2.31)
Low level of formal education†2.14 (0.96 to 4.80)
  • Analyses were adjusted for the other variables in the table by multivariate analysis.

  • *Current smokers vs non-smokers.

  • †⩽8 years of school vs university degree.