Development and validation of IMPACT-S, an ICF-based questionnaire to measure activities and participation.
OBJECTIVE
IMPACT-S is the screener part of the ICF Measure of Participation and ACTivities questionnaire. IMPACT-S consists of 33 items in 9 scales, reflecting the 9 activity and participation chapters of the International Classification of Functioning, Disability and Health (ICF). The reliability and validity of IMPACT-S as an independent brief measure of activities and participation was examined.


METHODS
Repeated administration of a postal questionnaire.


METHODS
Road accident victims were recruited through several Dutch hospitals and rehabilitation centres. A total of 276 patients participated and 197 took part in both measurements.


METHODS
Examination of test-retest reliability, reproducibility and construct validity. The World Health Organization Disability Assessment Schedule II (WHODAS-II) was included as criterion measure for concurrent validity.


RESULTS
Types of main injury were fractures (38%), trauma?tic brain injury (37%), spinal cord injury (13%), whiplash (9%) and other (3%). Mean time after injury was 2.2 years. Internal consistency of IMPACT-S was satisfying for all 9 domains (0.75-0.89) and excellent for the total score (0.96). Test-retest reliability was good at item level (0.44-0.72), domain level (0.72-0.92) and total score (0.94). Strong correlations (0.61-0.88) between IMPACT-S and corresponding WHODAS-II scores were found.


CONCLUSIONS
IMPACT-S is a reliable and valid generic measure of activity limitations and participation restrictions that fits the ICF.
Post
Marcel W M
MW
Rehabilitation Centre De Hoogstraat and Rudolf Magnus Institute for Neuroscience, Utrecht, The Netherlands. m.post@dehoogstraat.nl
de Witte
Luc P
LP
Reichrath
Enid
E
Verdonschot
Manon M
MM
Wijlhuizen
Gert Jan
GJ
Perenboom
Rom J M
RJ
D000063:Accidents, Traffic / Q000523:psychology; D000203:Activities of Daily Living; D000328:Adult; D000368:Aged; D004185:Disability Evaluation; D006233:Persons with Disabilities / Q000145:classification / Q000523:psychology / Q000534:rehabilitation*; D006801:Humans; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*; D014947:Wounds and Injuries / Q000534:rehabilitation*