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. Author manuscript; available in PMC: 2013 Jun 1.
Published in final edited form as: Nat Genet. 2012 Nov 11;44(12):1336–1340. doi: 10.1038/ng.2462

Table 1. Sample Collections.

Rheumatoid arthritis cases and controls for the Immunochip analysis were assembled from a number of different studies from 6 centres across 5 countries (online methods). Genotype data for additional samples analysed in previously published rheumatoid arthritis ACPA positive GWAS were available from 4 studies. Rheumatoid arthritis cases were classified as anti citrullinated peptide antigen (ACPA) positive and ACPA negative. F:M = female: male.

Collection Cases
 Controls
All % Female ACPA + ACPA − % Female
Immunochip UK 3870 74 2406 1000 8430 53
Swedish EIRA 2762 70 1762 987 1940 73
US 2536 75 1803 593 2134 65
Dutch 648 66 330 301 2004 42
Swedish Umea 852 70 524 242 963 69
Spanish 807 74 397 216 399 65
TOTAL 11475 73 7222 3339 15870 57
GWAS BRASS (US) 479 82 479 - 1627 45
Canada 586 76 586 - 1553 54
NARAC2 (US) 746 48 746 - 6567 49
WTCCC (UK) 552 74 552 - 8125 46
TOTAL 2363 68 2363 - 17872 48
TOTAL 13838 72 9585 3297 33742 52