Table 3 Content of 2-week phone call measures

Treatment compliance

- number of times visited trial physiotherapist so far

- extent of compliance with prescribed exercises

5 point Likert scale

Change in knee symptoms

- any change

- specific change

yes, no

5 point Likert scale

Knee pain intensity

11 point numerical rating scale (NRS)

Credibility of interventions

- confidence in received treatment

- logic of received treatment Adapted from [60]

5 point Likert scale

Experiences and expectations

- treatment met expectations

- expected improvement with treatment

5 point Likert scale

11 point NRS

Treatment preference

- want to change treatment receiving

yes, no, not sure