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Table 1 Descriptive characteristics by primary analysis outcome

From: Development of a clinical prediction algorithm for knee osteoarthritis structural progression in a cohort study: value of adding measurement of subchondral bone density

Characteristic Overall (n = 533) Non-progressors (n = 482) Progressors (n = 51)
Female (n, %) 252 (47%) 226 (47%) 26 (51%)
Age years (mean, SD) 64.6 (9.2) 64.2 (9.2) 68.3 (7.5)
Body mass index kg/m2 (mean, SD) 29.6 (4.8) 29.5 (4.7) 30.4 (4.9)
Knee pain (mean, SD) 3.5 (2.8) 3.4 (2.8) 4.1 (2.7)
Recent injury (n, %) 11 (2%) 9 (2%) 2 (4%)
Hand OA (n, %) 191 (36%) 160 (33%) 31 (61%)
M:L BMD (mean, SD) 1.1 (0.2) 1.1 (0.1) 1.2 (0.2)
Radiographic knee OA (n, %) 369 (69%) 324 (67%) 45 (88%)
  1. OA osteoarthritis, M:L BMD ratio medial-to-lateral tibial plateau bone mineral density ratio