Familial Risks and Heritability of Rheumatoid Arthritis: Role of Rheumatoid Factor/Anti–Citrullinated Protein Antibody Status, Number and Type of Affected Relatives, Sex, and Age

Objective To estimate familial aggregation of rheumatoid arthritis (RA) in 3 large population‐representative samples and to test if familial aggregation is affected by rheumatoid factor (RF)/anti–citrullinated protein antibody (ACPA) status, type of relative, sex, and age at onset of RA. Methods A r...

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