Related Experiment Video
Updated: Dec 7, 2025
Quantified Assessment of Infant's Gross Motor Abilities Using a Multisensor Wearable
Published on: May 17, 2024
Test of Infant Motor Performance for Infants in Brazil: Unidimensional Model, Item Difficulty, and Motor Function
Eloá Maria Dos Santos Chiquetti1, Nadia Cristina Valentini
1Universidade Federal do Pampa (Dr dos Santos Chiquetti), Uruguaiana, Rio Grande do Sul, Brazil; Universidade Federal do Rio Grande do Sul (Dr Valentini), Porto Alegre, Rio Grande do Sul, Brazil.
Insights
Early identification of developmental delays is crucial. The Test of Infant Motor Performance (TIMP) effectively measures infant motor skills, demonstrating its utility for assessing developmental differences in Brazilian infants.
Area of Science:
- Pediatrics
- Developmental Psychology
- Motor Development
Background:
- Early identification of developmental delays is essential for timely intervention.
- Existing assessment tools require validation for diverse populations.
Purpose of the Study:
- To evaluate the unidimensional model of the Test of Infant Motor Performance (TIMP) in Brazilian infants.
- To assess the TIMP's ability to explain item response variance, item hierarchy, difficulty levels, and functional differentiation.
Main Methods:
- A cohort of 655 infants in Brazil was assessed using the TIMP.
- Sociodemographic data were collected from participating families.
Main Results:
- The TIMP demonstrated high reliability (0.99) and appropriate item fit.
- The unidimensional model explained 74.3% of the variance, with 76.2% of items showing adequate factor relationships.
- Item difficulty levels and correlations indicated good discriminative ability.
Conclusions:
- The Test of Infant Motor Performance (TIMP) functions as a unidimensional measure.
- The TIMP exhibits varying item difficulty levels, suitable for differentiating infant performance.
- The TIMP is a sensitive tool for detecting performance differences in distinct infant groups in Brazil.
Background:
There is a need for appropriate tests to identify developmental delays early in life.
Objective:
This study investigates the Test of Infant Motor Performance (TIMP) unidimensional model and its ability to explain variance in items response, hierarchic order of the items, levels of difficulty, and the extent to which the items were appropriate to distinguish different levels of function for infants in Brazil.
Methods:
Six hundred fifty-five infants were assessed. Families provided sociodemographic information.
Results:
Appropriate items reliability (0.99), infit (mean = 0.99; SD = 0.46), outfit (mean = 1.34; SD = 1.58), and point-biserial correlations (-0.36 to 0.92) were obtained. The model explains 74.3% of the variance, and 76.2% of the items had adequate factor relationship.
Conclusion:
The TIMP measures a single construct, has items with different levels of difficulty, and is sensitive to detect differences in the performance of distinct groups for infants in Brazil.
