Table 1.

Baseline data items.

Item	Questions	Multiple choice answers
A1	In which of the following sites do you have OAa? (max 5)	Hand(s), Shoulder(s), Hip(s), Ankle(s), Foot/ feet
A2	In which knee is your OA typically more troublesome? (max 1)	Left, Right
A3	Thinking about your (A2: right/left) knee, what is the one activity, or action, that consistently causes you the most knee pain? (max 1)	Standing, Walking, Turning/twisting, Sitting for long periods, Sitting to standing, Squatting/bending/kneeling, Walking up stairs/inclines
A4	Thinking about your (A2: right/left) knee, what is the one activity, or action, most important for you to be able to do with minimal pain and difficulty? (max 1)	Socialise, Walk, Play sport, Do household tasks, Work effectively, Get washed and dressed

^aOA: osteoarthritis.