Figure 2.

Joint effect of farm history and personal insecticide exposure on RA/SLE risk.

*Hazard ratios and 95% confidence intervals estimated from a Cox proportional hazards regression model, adjusted for age (5 year intervals), race/ethnicity, education, occupation, region, pack-years of smoking, BMI, parity, months breastfed, age at menarche, age at menopause, history of asthma, history of other autoimmune disease, history of thyroid disease, modified Charlson index and farm exposure). Models analyzing frequency, duration and cumulative dose of personal use were also adjusted for any application by others.