Table 1

Case-referent evaluations of smoking habits in men (102 cases of RA and 248 referents) and women (179 cases of RA and 259 referents) from southeastern Sweden, 1980–95, with adjustment for age and socioeconomic status. ORs from separate analyses of 83 men and 134 women who were rheumatoid factor (RF) positive are also shown. Never users of tobacco are regarded as unexposed

  • 1-150 OR = Mantel-Haenszel odds ratio; CI = confidence interval as outlined by Robins et al.36 ORs are calculated with adjustment for age.

  • 1-151 Mean number of packs per day multiplied by the total number of years of smoking.