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Table 1 The number of cases and controls according to case definition and sample provenance.

From: Allelic variants of IL1R1gene associate with severe hand osteoarthritis

  Number of subjects
  Total Male Female
Hand OA material 168a 36 132
44 families with ≥ 2 DIP OA casesb 116 22 94
4 families with 1 DIP OA caseb 15 5 10
Additional radiologically verified DIP OA casesb 9 4 5
Physician diagnosed hand OA casesc 28 5 23
Knee OA materialb 113 27 86
Controls 436 277 159
Total 689 335 354
  1. a = The total number of affected individuals was 134 of which 85 were unrelated
  2. b = Radiologically verified OA cases
  3. c = Physician diagnosed hand OA; this group is also a part of radiological knee OA material