Limited evidence to strong evidence was found for reliability in various chronic conditions .
Little evidence was available for responsiveness and measurement error .
Studies showed large variability in test procedures despite existing guidelines for the performance of the 6MWT .
Evidence for measurement properties of the 6MWT  varies largely among chronic pediatric conditions .
BACKGROUND The Six-Minute Walk Test ( 6MWT ) is increasingly being used as a functional outcome measure for chronic pediatric conditions .
Knowledge about its measurement properties is needed to determine whether it is an appropriate test to use .
PURPOSE The purpose of this study was to systematic ally review all published clinimetric studies on the 6MWT in chronic pediatric conditions .
Determining the minimal clinically important difference for the six-minute walk test and the 200-meter fast-walk test during cardiac rehabilitation program in coronary artery disease patients after acute coronary syndrome.
OBJECTIVE To estimate the minimal clinical ly important difference ( MCID ) for the 6-minute walk test ( 6MWT ) and the 200-m fast-walk test ( FWT ) in patients with coronary artery disease ( CAD ) during a cardiac rehabilitation program . DESIGN Prospect i ve study using distribution- and anchor-based methods . SETTING Out patients from a cardiac rehabilitation unit . PARTICIPANTS Stable patients with CAD ( N=81 ; 77 men ; mean±SD age , 58.1±8.7y ) enrolled 31±12.1 days after an acute coronary syndrome ( ACS ) . INTERVENTIONS Not applicable . MAIN OUTCOME MEASURES  6MWT and 200-m FWT results before and after an 8-week cardiac rehabilitation program and at the 6th and 12th sessions . Patients and physiotherapists who supervised the training were asked to provide a global rating of perceived change in walking ability while blinded to changes in walk test performances . RESULTS Mean change in 6MWT distance ( 6MWD ) in patients who reported no change was -6.5 m versus 23.3 m in those who believed their performance had improved ( P<.001 ) . This result was consistent with the MCID determined by using the distribution method ( 23 m ) . Considering a 25-m cutoff , positive and negative predictive values were 0.9 and .63 , respectively . Conversely , there was no difference in 200-m FWT performance between these 2 groups ( 0.1 vs -1.4s , respectively ) . There was poor agreement with the physiotherapist 's perceived change . CONCLUSIONS The MCID for 6MWD in patients with CAD after ACS was 25 m . This result will help physicians interpret 6MWD change and help research ers estimate sample sizes in further studies using 6MWD as an endpoint
Limited evidence to strong evidence was found for reliability in various chronic conditions .
Little evidence was available for responsiveness and measurement error .
Studies showed large variability in test procedures despite existing guidelines for the performance of the 6MWT .
Evidence for measurement properties of the 6MWT  varies largely among chronic pediatric conditions .
BACKGROUND The Six-Minute Walk Test ( 6MWT ) is increasingly being used as a functional outcome measure for chronic pediatric conditions .
Knowledge about its measurement properties is needed to determine whether it is an appropriate test to use .
PURPOSE The purpose of this study was to systematic ally review all published clinimetric studies on the 6MWT in chronic pediatric conditions .