Table 5.

Proportion of knee pain positive patients with radiographic knee OA (A/P views) according to the definition of knee pain.

Study	% Knee pain positive in those with Radiographic OA	Definition of knee pain positive subjects
Hannan [25]	47	Pain, swelling, morning stiffness in or around the knee on most days for one month
		Positive response to both parts required:
Parts A & B		(A) Have you ever had pain in or around the knee on most days for one month?
Lanyon [8]	81
Lethbridge [10]	64
Part A only		(B) If so, have you experienced pain in the last year?
Felson [20]	40
Lethbridge [10]	53
Cicuttinni [26]	20	Ever having an episode of knee pain lasting more than 15 days
Lachance [13]	35 (CA) 50 (AA)	Any joint pain in their knees during the last during the last month
Hart [18]	56	Pain, stiffness and swelling lasting more than a month
Odding [14]	59	Knee pain during the past month
Davis [27]	59	Knee pain on most days lasting for one month in the past year

CA – Caucasian, AA – African American, N/A – not applicable.