Estimating the Accuracy of the Chedoke-McMaster Stroke Assessment Predictive Equations for Stroke Rehabilitation.
OBJECTIVE
To estimate the predictive accuracy and clinical usefulness of the Chedoke-McMaster Stroke Assessment (CMSA) predictive equations.


METHODS
A longitudinal prognostic study using historical data obtained from 104 patients admitted post cerebrovascular accident was undertaken. Data were abstracted for all patients undergoing rehabilitation post stroke who also had documented admission and discharge CMSA scores. Published predictive equations were used to determine predicted outcomes. To determine the accuracy and clinical usefulness of the predictive model, shrinkage coefficients and predictions with 95% confidence bands were calculated.


RESULTS
Complete data were available for 74 patients with a mean age of 65.3±12.4 years. The shrinkage values for the six Impairment Inventory (II) dimensions varied from -0.05 to 0.09; the shrinkage value for the Activity Inventory (AI) was 0.21. The error associated with predictive values was greater than ±1.5 stages for the II dimensions and greater than ±24 points for the AI.


CONCLUSIONS
This study shows that the large error associated with the predictions (as defined by the confidence band) for the CMSA II and AI limits their clinical usefulness as a predictive measure. Further research to establish predictive models using alternative statistical procedures is warranted.
Mia Dang, BSc Eng, MSc(PT):  Physical therapist and graduate of the MSc(PT) Program, School of Rehabilitation Science, McMaster University, Hamilton, Ontario.
Mia
M
Dang
Kalinda D
KD
Ramsaran
Melissa E
ME
Street
S Noreen
SN
Syed
Ruth
R
Barclay-Goddard
Paul W
PW
Stratford
Patricia A
PA
Miller
D006801:Humans; D008137:Longitudinal Studies; D010351:Patient Discharge; D020521:Stroke; D000071939:Stroke Rehabilitation