Table 1.

Characteristics of the study population

	ACPA(+) RA susceptibility	ACPA levels
Set 1
No of subjects	3062 vs 2008	2488
Institution	Kyoto University, Tokyo Women’s Medical University	Kyoto University, Tokyo Women’s Medical University
HLA-DRB1	Genotyping	Genotyping
Set 2
No of subjects	2519 vs 17162	1883
Institution	RIKEN	RIKEN
HLA-DRB1	Imputation	Genotyping

ACPA, anticitrullinated protein/peptide antibody; RA, rheumatoid arthritis.