Knee Joint pain	Radiographic Knee OA	Baseline PA	Sex	Race
Final harmonised variable	Symptomatic Radiographic OA based on radiographic OA and self-reported pain		1) MET days/week 2) Hrs/wk spent in PA	Male/female	1. Caucasian 2. African American 3. Japanese 4. Asian 5. Indigenous Australian 6. Hispanic 7. Other
Chingford	Baseline: Participants were classified as having current joint if they reported positively to: current pain (yes) and duration was more than 1 month. Follow up: pain for more than 15 days in the last month. How many days in the last month have you had knee pain?	Baseline and follow up K&L knee grade 0–4	Length walked in a week? Time spent in sport over a week? Ever engage in regular activity long enough to work up a sweat? Type of activity engaged in for long enough to work up a sweat? Times per week engaged in the activity which gives you a sweat? Name of activity(1) which you regularly participate in? Minutes spent per week engaging in activity(1)? Continues for activities 1–5.	Female	Caucasian
HCS	Baseline: Pain on most days in the last month (Right/left) Follow up: person level WOMAC (not side specific)	Baseline and follow up: K&L knee grade 0–4	Which of the following activities do you do at least once a month on average or at least 12 times per year? Bowls Cycling Swimming Golf Fishing Dancing Other active sport Duration of activity based on averages from Herts West participants	Male & female	Caucasian
JoCoOA 1	Baseline: In the PAST MONTH on MOST DAYS, have you had pain, aching, or stiffness in your KNEES? Follow up: side level WOMAC	Baseline and follow up: K&L knee grade 0–4	In the last year did you perform this activity? Which months? Average number of times per month Time per occasion (list of over 50 leisure time activities)	Male & female	-Caucasian -African American
Framingham	Baseline and follow-up: On most days do you have pain, aching or stiffness in either of your knees? Is the pain aching or stiffness in your right knee, left knee, or both knees?	Baseline and follow up K&L knee grade 0–4	Hours spent on slight, sedentary, moderate and heavy PA per day	Male & female	-Caucasian -African American -Asian -other
MOST	Baseline: i) “During the past 12 months, have you had any pain, aching, or stiffness in your knee?” ii) “During the past 30 days, have you had any pain, aching, or stiffness in your knee?” iii) “During the past 30 days, have you had pain, aching, or stiffness in your knee on most days?”. Participants who reported a positive response to all three questions were classified as having current knee symptoms. (same for both baseline and follow-up) follow-up: Knee pain lasting most days in the last month?	Baseline and follow up: K&L knee grade 0–4	Hours/day - Light rec activities/Moderate recreational activities/Strenuous recreational activities/Exercise for muscle strength PAST 7 Days	Male & female	-Caucasian -Black or African American -other
TASOAC	Baseline and follow-up: Person level WOMAC (not side specific)		Days per week and minutes per day doing vigorous activities Days per week and minutes per day doing moderate activities