Table 1.

Characteristics of the hypothetical vignettes

Vignette	Hypothetical History of the Patient	Level of Activity
1	35 year old patient with symptomatic ADLs	I
2	35 year old patient who can perform ADLs without symptoms but no kind of sports	II
3	35 year old patient with knee symptoms with mildly stressful sports (e.g. jogging, swimming, biking)	III
4	35 year old patient with knee symptoms with moderately stressful sports (e.g. baseball, alpine skiing, dance)	IV

Hypothetical vignettes were based on activity levels I to IV as described by Gottlob et al [34].