Related Experiment Videos
Development of a functional movement scale for infants
Suzann K Campbell1, Benjamin D Wright, J Michael Linacre
1Department of Physical Therapy, University of Illinois at Chicago, 1919 W. Taylor Street M/C 898, Chicago, IL 60612-7251, USA. skc@uic.edu
Insights
Researchers refined the Test of Infant Motor Performance (TIMP) using Rasch analysis. This shorter, 42-item version accurately identifies motor delays in infants, aiding early physical therapy interventions.
Area of Science:
- Pediatrics
- Developmental Pediatrics
- Rehabilitation Medicine
Background:
- Increasing infant survival rates with complicated births necessitate early developmental assessments.
- The Test of Infant Motor Performance (TIMP) is crucial for identifying motor delays in infants under four months.
- Physical therapy can effectively address identified developmental delays.
Purpose of the Study:
- To conduct a Rasch analysis of the TIMP's psychometric properties.
- To reduce the TIMP's length while preserving measurement precision.
- To create a more efficient tool for assessing infant motor performance.
Main Methods:
- Rasch analysis was applied to evaluate the TIMP's psychometric qualities.
- Analysis included fit statistics, item-to-total correlations, and item difficulty redundancy.
- Clinical relevance of test items was considered in the reduction process.
- Data from 1732 infant tests were analyzed.
Main Results:
- The TIMP was successfully reduced from 59 to 42 items.
- The revised scale maintains high precision for measuring functional motor performance.
- The resulting person separation index was 4.85 and item separation index was 23.79, indicating robust psychometric properties.
Conclusions:
- The shortened TIMP is a psychometrically sound tool for assessing functional motor skills in infants.
- This refined test facilitates efficient identification of motor delays in prematurely born infants.
- The optimized TIMP supports timely and targeted physical therapy interventions.
Abstract:
The increasing survival rate of infants with a complicated birth and perinatal history generated the need for a test of functional motor performance with the capability of identifying children under four months of age with delayed development which could be addressed with physical therapy. This paper describes a Rasch analysis of the psychometric qualities of the Test of Infant Motor Performance (TIMP) for the purpose of reducing the length of the test while maintaining its precision as a measurement device. Following analysis of fit statistics, item-to-total correlations, redundancy of item difficulty measures, and consideration of clinically-relevant features of test items from analysis of 1732 tests, the TIMP was reduced from 59 to 42 items forming a functional motor scale for prematurely born infants. The resulting person separation index was 4.85 and the item separation index was 23.79.