Comparing the reliability of five participation instruments in persons with spinal conditions.
OBJECTIVE
To compare the score distribution and reliability of 5 participation instruments developed using the International Classification of Functioning, Disability and Health.


METHODS
Individuals treated for spinal conditions at an acute hospital were followed-up and 545 participated. Subjects completed 5 participation instruments (Impact on Participation and Autonomy (IPA), Keele Assessment of Participation (KAP), Participation Measure-Post Acute Care (PM-PAC), Participation Objective Participation Subjective (POPS) and World Health Organization Disability Assessment Schedule II (WHODAS II)). Test-retest reliability was assessed in 139 subjects. The score distribution, internal consistency and test-retest reliability were assessed.


RESULTS
All the instruments demonstrated considerable ceiling effects, except for the POPS. Internal consistency (Cronbach's alpha) was > or = 0.70 for all domains. The IPA and WHODAS II had the highest test-retest values, with intra-class correlation coefficients > or = 0.70. The minimal detectable change as a percentage of the absolute scale score range was primarily between 20% and 30%.


CONCLUSIONS
The IPA, PM-PAC and WHODAS II have similar measurement properties. The KAP was designed for -population-based studies and the POPS includes objective and subjective information, which may explain some of the differences observed. Researchers and clinicians should select an instrument that will fulfil their measurement objectives and future studies should assess minimal important change.
Noonan
Vanessa K
VK
Division of Spine, Department of Orthopaedics, University of British Columbia, Vancouver, BC, Canada. Vanessa.Noonan@vch.ca
Kopec
Jacek A
JA
Noreau
Luc
L
Singer
Joel
J
Mâsse
Louise C
LC
Dvorak
Marcel F
MF
D000203:Activities of Daily Living; D000328:Adult; D004185:Disability Evaluation; D006233:Persons with Disabilities / Q000145:classification*; D005500:Follow-Up Studies; D006801:Humans; D038801:International Classification of Diseases; D017063:Outcome Assessment, Health Care; D011788:Quality of Life; D015203:Reproducibility of Results; D012649:Self Concept; D013119:Spinal Cord Injuries / Q000503:physiopathology / Q000523:psychology / Q000534:rehabilitation*; D013122:Spinal Diseases / Q000503:physiopathology / Q000523:psychology / Q000534:rehabilitation*