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Arch Phys Med Rehabil. 2006 Sep;87(9):1223-9.

Measurement precision and efficiency of multidimensional computer adaptive testing of physical functioning using the pediatric evaluation of disability inventory.

Author information

1
Health and Disability Research Institute, Boston University, Boston, MA 02215, USA. smhaley@bu.edu

Abstract

OBJECTIVE:

To compare the measurement efficiency and precision of a multidimensional computer adaptive testing (M-CAT) application to a unidimensional CAT (U-CAT) comparison using item bank data from 2 of the functional skills scales of the Pediatric Evaluation of Disability Inventory (PEDI).

DESIGN:

Using existing PEDI mobility and self-care item banks, we compared the stability of item calibrations and model fit between unidimensional and multidimensional Rasch models and compared the efficiency and precision of the U-CAT- and M-CAT-simulated assessments to a random draw of items.

SETTING:

Pediatric rehabilitation hospital and clinics.

PARTICIPANTS:

Clinical and normative samples.

INTERVENTIONS:

Not applicable.

MAIN OUTCOME MEASURES:

Not applicable.

RESULTS:

The M-CAT had greater levels of precision and efficiency than the separate mobility and self-care U-CAT versions when using a similar number of items for each PEDI subdomain. Equivalent estimation of mobility and self-care scores can be achieved with a 25% to 40% item reduction with the M-CAT compared with the U-CAT.

CONCLUSIONS:

M-CAT applications appear to have both precision and efficiency advantages compared with separate U-CAT assessments when content subdomains have a high correlation. Practitioners may also realize interpretive advantages of reporting test score information for each subdomain when separate clinical inferences are desired.

PMID:
16935059
DOI:
10.1016/j.apmr.2006.05.018
[Indexed for MEDLINE]
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