Abstract
Objective
To improve the practical use of the short forms (SFs) developed from the item bank,
we compared the measurement precision of the 4- and 8-item SFs generated from a motor
item bank composed of the FIM and the Minimum Data Set (MDS).
Design
The FIM-MDS motor item bank allowed scores generated from different instruments to
be co-calibrated. The 4- and 8-item SFs were developed based on Rasch analysis procedures.
This article compared person strata, ceiling/floor effects, and test SE plots for
each administration form and examined 95% confidence interval error bands of anchored
person measures with the corresponding SFs. We used 0.3 SE as a criterion to reflect
a reliability level of .90.
Setting
Veterans' inpatient rehabilitation facilities and community living centers.
Participants
Veterans (N=2500) who had both FIM and the MDS data within 6 days during 2008 through 2010.
Interventions
Not applicable.
Main Outcome Measures
Four- and 8-item SFs of FIM, MDS, and FIM-MDS motor item bank.
Results
Six SFs were generated with 4 and 8 items across a range of difficulty levels from
the FIM-MDS motor item bank. The three 8-item SFs all had higher correlations with
the item bank (r=.82-.95), higher person strata, and less test error than the corresponding 4-item
SFs (r=.80-.90). The three 4-item SFs did not meet the criteria of SE <0.3 for any theta
values.
Conclusions
Eight-item SFs could improve clinical use of the item bank composed of existing instruments
across the continuum of care in veterans. We also found that the number of items,
not test specificity, determines the precision of the instrument.
Keywords
List of abbreviations:
CI (confidence interval), IRT (item response theory), MDS (Minimum Data Set), PAC (postacute care), SF (short form), SNF (skilled nursing facility), VA (Veterans Administration)To read this article in full you will need to make a payment
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Article info
Publication history
Published online: July 26, 2017
Footnotes
Supported by the Department of Veterans Affairs, Health Services Research and Development, North Florida/South Georgia Veterans Health System, Center of Innovation on Disability and Rehabilitation Research and the University of Florida (grant no. IR 11-223-1).
Disclosures: none.
Identification
Copyright
© 2017 by the American Congress of Rehabilitation Medicine
