Case-referent evaluations of comorbidity, infections, education and some environmental exposures in men (102 cases of RA and 248 referents) from southeastern Sweden, 1980–95, with adjustment for age
| Exposed cases/referents | OR3-150 | 95% CI3-150 | |
| Weight | |||
| BMI 263-151 | 1/13 | 0.1 | 0.0 to 1.0 |
| Comorbidity | |||
| Asthma | 3/9 | 0.6 | 0.2 to 2.4 |
| Allergy | 5/32 | 0.4 | 0.2 to 1.1 |
| Eczema | 5/13 | 1.0 | 0.3 to 2.8 |
| Medication | |||
| Antibiotics | 69/156 | 1.6 | 0.9 to 2.8 |
| Infections | |||
| Infected wounds3-152 | 8/15 | 1.5 | 0.6 to 3.8 |
| Educational level3-153 | |||
| Compulsory school | 49/82 | 1.0 | – |
| Continuation/vocational school | 32/66 | 0.9 | 0.5 to 1.7 |
| Secondary/upper secondary school | 6/35 | 0.6 | 0.2 to 1.7 |
| University | 11/59 | 0.5 | 0.2 to 1.1 |
| Environmental exposures | |||
| Private well at birth | 67/105 | 2.8 | 1.5 to 5.2 |
| Mould at birth | 3/0 | – | – |
| Mould3-154 | 6/3 | 4.6 | 1.1 to 20.2 |
| Farm animals3-160 | 45/60 | 3.3 | 0.7 to 16.6 |
| Psychosocial stress | |||
| Problems at work3-164 | 8/6 | 3.8 | 1.2 to 11.5 |
| Economic problems3-161 | 7/6 | 3.3 | 1.0 to 10.2 |
↵3-150 OR = Mantel-Haenszel odds ratio; CI = confidence interval as outlined by Robins et al.36
↵3-151 At age 25, with adjustment also for age and socioeconomic status.
↵3-152 Latency requirement 10 years.
↵3-153 Adjustment also for smoking and employment in high risk occupations.
↵3-154 Adjustment also for farm work, latency requirement 15 years.
↵3-160 Adjustment also for farm work, latency requirement 20 years.
↵3-164 Exposure during the 5 year period preceding the diagnosis of RA.
↵3-161 Exposure during the 5 year period preceding the onset of RA symptoms.