Table 2

Characteristics at baseline of the study participants in the verification and replication phases

CovariatesVerification phaseReplication phase
Incident OA (n=146)Non-incident OA (n=181)Incident OA (n=65)Non-incident OA (n=43)
Age, mean years (SD)60.65 (8.51)56.61 (8.57)58.26 (9.40)59.86 (8.50)
Sex, n (%) female98 (67.1)102 (56.4)26 (60.5)25 (38.5)
BMI, mean kg/m2 (SD)28.93 (4.59)25.88 (4.14)29.75 (4.94)28.29 (3.69)
Frequent knee bending activity, n (%) yes110 (75.3)106 (58.6)30 (71.4)27 (41.5)
History of knee injury, n (%) yes39 (26.7)23 (12.7)9 (21.4)7 (10.9)
WOMAC pain score1.63 (2.36)0.61 (1.63)3.21 (3.58)1.68 (2.43)
  • BMI, body mass index; WOMAC, Western Ontario and McMaster Universities Osteoarthritis Index.