Table 3.

Comparison of WOMAC scores between studies employing varying definitons of knee pain positive patients.

Study	Pain +ve WOMAC definition	WOMAC score in those with knee pain but no radiographic knee OA compared to those with radiographic knee OA
Brandt [24]	Greater than moderate (> 3) for any of the five categories on more than half the days in the month preceding evaluation	No significant difference
Williams [21]	Currently had mild pain or greater (> 0).	No significant difference
Ang [23]	Current or past pain, WOMAC transposed to a scale of 0 – 100	No significant difference