In general , estimates of construct validity were lower when vali date d against dissimilar constructs , except for instruments measuring impairments in mental functions .
CONCLUSION There is a trend that validation against a similar construct yields higher correlation coefficients than validation against a dissimilar construct .
PURPOSE This paper focuses on the construct validity of instruments measuring impairments in body structures and function in rheumatic disorders .
The objective is : 1 ) to make an inventory of constructs , based on the domains of the International Classification of Functioning , Disabilities and Health problems ( ICF ) , against which instruments measuring impairments in body structures and function were vali date d ; 2 ) to analyse whether validation against a similar construct result ed in higher correlation coefficients than validation against a dissimilar construct .
The modified sphygmomanometer-an instrument to measure muscle strength: a validation study.
Is the modified aneroid sphygmomanometer a valid instrument to measure isometric quadriceps strength ? Three techniques were compared : the cuff method , in which the original cuff and bladder were folded then secured by rubber b and s ; the bag method , in which the folded bladder was secured in a sewn bag ; and a st and ard method , employing weights . Using a design to control for method and order of measurement , five physiotherapists measured quadriceps muscle strength in five rheumatoid patients . The design features explained 97 % of the variation amongst the measurements . Order of observation and the observers had no effect on the measurements . Patients were quite different and methods of measurement were different . The cuff and bag methods obtained higher readings than the weights , and the bag readings were higher than the cuff . Compared to the st and ard weights , the sphygmomanometer methods were : equally sensitive and reproducible , performed in 16th of the time , independent of gravity and potentially adaptable to 24 different muscle groups
In general , estimates of construct validity were lower when vali date d against dissimilar constructs , except for instruments measuring impairments in mental functions .
CONCLUSION There is a trend that validation against a similar construct yields higher correlation coefficients than validation against a dissimilar construct .
PURPOSE This paper focuses on the construct validity of instruments measuring impairments in body structures and function in rheumatic disorders .
The objective is : 1 ) to make an inventory of constructs , based on the domains of the International Classification of Functioning , Disabilities and Health problems ( ICF ) , against which instruments measuring impairments in body structures and function were vali date d ; 2 ) to analyse whether validation against a similar construct result ed in higher correlation coefficients than validation against a dissimilar construct .