Additional file 1.

Rank-ordered Relative Risks of co-morbidities in patients with rheumatoid arthritis. RR as compared with control group (N = 61,591 for each group). 16 years and older. Arthritis/RA-related codes included. Conditions included for which there were at least 20 controls. Number of RA cases in table may be less than 20 if RR < 1, i.e. if fewer cases than controls have condition. Shown: ICD9 codes, description of co-morbidity, number of persons in group with RA, percentage of group with RA, Relative Risk. NOS: Not otherwise specified NEC: Not elsewhere classified

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Petri et al. BMC Musculoskeletal Disorders 2010 11:247   doi:10.1186/1471-2474-11-247