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Table 2 Inclusion and exclusion criteria used in claims-based definitions of RA

From: The validity of the claims-based definition of rheumatoid arthritis evaluated in 64 hospitals in Japan

Description Code Frequency in 12 monthly claims
Inclusion criteria
 1 Condition code of RA without “suspect” flag 1A in 1 one or more monthly claims
1B in 1 inpatient monthly claim or 2 or more outpatient monthly claims
 2 Prescription of any DMARD 2A in 1 or more monthly claims
2B in 2 or more monthly claims
 3 Prescription of oral corticosteroid 3A in 1 or more monthly claims
3B in 2 or more monthly claims
Exclusion criterion
 4 Systemic autoimmune diseases (other than RA) or PMR 4 in no claim
  1. RA Rheumatoid arthritis, DMARD Disease-modifying antirheumatic drugs, PMR Polymyalgia rheumatica