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Submitted on September 22, 2003
Accepted on June 21, 2004
Affiliation of the authors: 1 Department of Clinical Epidemiology and School of Physical and Occupational Therapy, McGill University Health Center, Montreal, Quebec, Canada; 2 Department of Clinical and Health Informatics, McGill University Health Center, Montreal, Quebec, Canada; 3 Department of Clinical Epidemiology, McGill University Health Center, Montreal, Quebec, Canada; 4 School of Physical and Occupational Therapy, McGill University Health Center, Montreal, Quebec, Canada; 5 Respiratory Epidemiology and Clinical Research Unit, McGill University Health Center, Montreal, Quebec, Canada; 6 Department of Physical Therapy, University of Toronto, Toronto, Canada
* To whom correspondence should be addressed.
Objective The purpose of this proof-of-concept study was to assess the feasibility of using a generic health measure to create coded functional status indicators and compare the characterization of a stroke population using coded functional indicators and using HRQL summary measures alone.
Design Multiple raters assigned ICF codes to the items of the SF-12. Data for comparing the information from the SF-12 and from ICF codes were derived from the Montreal Stroke Cohort Study that was set up to examine the long-term impact of stroke. Available for analysis were data from 604 persons with stroke, average age 69 years, and 488 controls, average age 62 years.
Measurement The SF-12 provides two summary scores, one for physical health and one for mental health. Domains of the ICF are coded to 3 digits, prior to the decimal place; specific categorizations of impairments, activity limitations and participation restrictions are coded to 4 digits, prior to the decimal.
Results Persons with stroke scored, on average, about 10 points lower than controls on physical and mental health. The ICF coding indicated that this was attributed, not surprisingly, to greater difficulty in doing moderate activities including housework, climbing stairs and in working and was not attributed to differences in pain. Differences in mental health were attributed most strongly to greater fatigue (impairment in energy), but all areas of mental health were impacted upon to some degree.
Conclusion The ICF coding provided enhanced functional status information in a format compatible with the structure of administrative health databases.
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