Table 1

Characteristics of the three groups studied. Figures denote median (range)

OA grade I (joint space narrowing) Controls with knee pain Healthy controls
No45458
Age (years)46.2  (35–54)45.3  (35–54)38  (29–55)
Sex (male/female)24/2125/208/0
BMI26.125.1
  • BMI, body mass index; OA, osteoarthritis.