Article

OBJECTIVES: To examine the psychometric properties of the Nottwil Environmental
Factors Inventory Short Form using Rasch analysis; to determine its construct
validity and internal consistency; and to develop a metric for scoring. DESIGN:
Cross-sectional psychometric study. Construct validity of the Nottwil
Environmental Factors Inventory Short Form, including model fit, person and item
fit, local item dependence, dimensionality, and differential item functioning
(DIF), was investigated with Rasch analysis. Internal consistency was assessed
with Cronbach alpha and item-total correlations. SETTING: Community.
PARTICIPANTS: Swiss residents aged >16 years and living with traumatic or
nontraumatic spinal cord injury (SCI) (N=1549). INTERVENTIONS: Not applicable.
MAIN OUTCOME MEASURE: The Nottwil Environmental Factors Inventory Short Form, a
14-item questionnaire developed to assess perceived impact of environmental
barriers on participation. RESULTS: Local dependencies between items addressing a
similar content could be solved by creating a testlet. With 1 testlet there was
strong evidence for unidimensionality of the Nottwil Environmental Factors
Inventory Short Form. Although person-item targeting revealed a floor effect,
indicating few perceived environmental barriers to participation in the Swiss SCI
population, the item fit was good. Only a few items presented DIF. The Nottwil
Environmental Factors Inventory Short Form showed good internal consistency
(alpha=.82). CONCLUSIONS: This psychometric analysis supports the use of the
Nottwil Environmental Factors Inventory Short Form to evaluate perceived
environmental barriers to participation in persons with SCI living in the
community.
CI - Copyright (c) 2015 American Congress of Rehabilitation Medicine. Published by
Elsevier Inc. All rights reserved.

Langue : ANGLAIS