Article

Agreement, concurrent validity, and floor and ceiling effects of
the 8-item Participation Index (M2PI) of the Mayo-Portland
Adaptability Inventory (MPAI).
Design: M2PI data derived from MPAIs completed independently
by the people with acquired brain injury undergoing
evaluation, their significant others, and rehabilitation staff were
submitted to Rasch Facets analysis to determine the internal
consistency of each independent rater group and of composite
measures that combined rater groups. Correlations with the
full-scale MPAI were examined to assess concurrent validity,
as was interrater agreement.
Setting: Outpatient rehabilitation in academic physical medicine
and rehabilitation department.
Participants: People with acquired brain injury (N
134)
consecutively seen for evaluation, significant others, and evaluating
staff.
Interventions: Not applicable.
Main Outcome Measures: The MPAI and M2PI.
Results: The M2PI showed satisfactory internal consistency,
concurrent validity, interrater agreement, and minimal floor
and ceiling effects, although evidence of rater bias was also
apparent. Composite indices showed more desirable psychometric
properties than ratings by individual rater groups.
Conclusions: The M2PI, particularly in composite indices
and with attention to rater biases, provides an outcome measure
with satisfactory psychometric qualities and the potential to
represent the varying perspectives of people with acquired
brain injury, significant others, and rehabilitation staff.

Langue : ANGLAIS