6-Minute Walk Test
ICF category	Measurement of activity limitation: walking long distances
Description	A physical performance measure which assesses how far a person can walk in 6 minutes48
Measurement method	During the performance of the 6-minute walk test (6MWT), patients are instructed to cover as much distance as possible during the 6-minute time frame, with the opportunity to stop and rest if required. The test is conducted on an unobstructed level surface. The course is marked off in meters, and the distance traveled by each subject is measured to the nearest meter. Standardized verbal encouragement, “You are doing well, keep up the good work” is provided at 60-second intervals. Patients are permitted to use their regular walking aids if needed.102
Nature of variable	Continuous
Units of measurement	Meters
Measurement properties	The 6MWT showed high test-retest reliability (ICC2,1 of 0.95–0.97).170 Kennedy et al102 also showed high test-retest reliability for the 6MWT with ICC2,1 of 0.94 (95% CI: 0.88–0.98). The MDC90 for the 6MWT determined from a sample of 150 subjects with hip and knee OA, of which 69 underwent total hip arthroplasty (THA) was 61.34 m.102