Patient and normal subject characteristics
| Subject group | Number of subjects | Male:female | Age (mean (range) years) | Osteophyte formation (median (IQ range)) | Joint space narrowing (median (IQ range)) | Total x ray score (median (IQ range)) |
| Normal | 38 | 13:25 = 1:1.92 | 45 (21-83) | — | — | — |
| RA | 29 | 6:23 = 1:3.83 | 59 (28-85) | 1 (0-3) | 3.5 (2-5.5) | 5 (3-8) |
| LJOA | 57 | 26:31 = 1:1.19 | 69 (41-90) | 3 (2-5) | 3 (2-4) | 6 (4-8) |
| NGOA | 22 | 2:20 = 1:10 | 72 (56-87) | 4 (3-6) | 4 (3-4) | 8 (6-10) |
| CPA | 23 | 13:10 = 1.3:1 | 70 (49-92) | 4 (3-8.5) | 4 (3-5) | 8.5 (6.5-13) |