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 .
Clinical assessment of disease activity in rheumatoid arthritis: evaluation of a functional test.
A cross sectional analysis of the correlation between clinical , laboratory , and radiological markers of disease activity in 98 patients with classical rheumatoid arthritis ( RA ) is reported . The median age was 38 years , the median age at onset of disease 29 years , and the median duration of disease seven years . The  Keitel function test ( KFT ) showed good correlation with the Ritchie articular index ( RAI ) ( p less than 0.0001 ; r = 0.5 ) and the disability question naire ( DQ ) ( p less than 0.0001 ; r = 0.6 ) . The RAI and DQ correlated weakly with laboratory variables , while the KFT showed significant correlation with the erythrocyte sedimentation rate ( ESR ) , C reactive protein ( CRP ) , and plasma viscosity ( PV ) ( p less than 0.001 ; r = 0.4 ; 0.3 ; 0.4 ) . Only the KFT showed significant correlations with bone mass measurements ( p less than 0.01 ; r = -0.3 ; -0.4 ) , and the Larsen index at the right wrist ( p less than 0.0001 ; r = 0.4 ) . Consensus analysis suggested that the KFT is a useful single clinical test of disease activity in RA . The h and functional index ( HFI ) , a component of the KFT , showed significant correlation with the total KFT ( r = 0.9 ) . Prospect i ve drug trials are needed to establish the value of the HFI in the monitoring of patients with RA
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 .