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. Author manuscript; available in PMC: 2018 Jun 21.
Published in final edited form as: Arthritis Rheumatol. 2018 Apr 21;70(6):957–962. doi: 10.1002/art.40443

Table 1.

Breakdown of RF-positive polyarticular JIA case and control cohort by population before and after quality control (QC)

Population Pre QC
Cases
Pre QC
Controls
Post QC
Cases
Post QC
Controls
US 272 5985 222 4408
UK 104 8940 94 8579
Germany 15 489 1 480
Norway 14 989 13 945
Canada 16 10
Total 421 16403 340 14412