Identification of neurodevelopmental abnormality at four and eight months by the movement assessment of infants
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M W Swanson1, F C Bennett, K K Shy
1Department of Rehabilitation Medicine, University of Washington, Seattle 98195.
Insights
The Movement Assessment of Infants (MAI) effectively predicts neurodevelopmental outcomes in low-birthweight infants. While sensitive, the MAI and Bayley Scales show lower specificity at eight months due to transient motor issues.
Area of Science:
- Pediatrics
- Neurodevelopmental Pediatrics
- Infant Motor Development
Background:
- Low-birthweight infants are at increased risk for neurodevelopmental abnormalities.
- Early neuromotor assessment is crucial for identifying infants needing intervention.
- The Movement Assessment of Infants (MAI) is a tool used for evaluating infant motor function.
Purpose of the Study:
- To investigate the predictive validity of the Movement Assessment of Infants (MAI) in low-birthweight infants.
- To compare the predictive accuracy of MAI with the Bayley Scales of Infant Development.
- To identify specific MAI components most predictive of neurodevelopmental outcomes.
Main Methods:
- Longitudinal study of low-birthweight infants.
- Neuromotor evaluation using the Movement Assessment of Infants (MAI) at four and eight months corrected age.
- Neurodevelopmental outcome assessed using the Bayley Scales of Infant Development at 18 months corrected age.
- Correlational analysis between MAI scores and Bayley Scales performance.
Main Results:
- Strong correlations were found between total MAI risk scores at four and eight months and Bayley Scales performance at 18 months.
- Muscle tone assessment at four months and automatic reactions/volitional movement at eight months were most predictive.
- The MAI demonstrated high sensitivity for detecting neurodevelopmental abnormalities at both four and eight months.
- Both MAI and Bayley Motor Scale showed lower specificity at eight months, with a high false-positive rate attributed to transient neuromotor issues.
Conclusions:
- The Movement Assessment of Infants (MAI) is a valid tool for predicting neurodevelopmental outcomes in low-birthweight infants.
- Specific components of the MAI, particularly at eight months, offer valuable predictive information.
- Transient neuromotor abnormalities and functional immaturity contribute to a higher false-positive rate in early assessments of low-birthweight infants.
Abstract:
The predictive validity of infant neuromotor evaluation by the Movement Assessment of Infants (MAI) was investigated in low-birthweight infants. Motor performance at four and eight months was examined in relation to neurodevelopmental outcome at 18 months of age. Correlations were equally strong between total MAI risk scores at four and eight months and performance on the Bayley Scales. Muscle tone observations were more discriminating at four months, and automatic reactions and volitional movement were most predictive at eight months. The MAI was highly sensitive to neurodevelopmental abnormality at four and eight months and more sensitive than the Bayley Motor Scale; both assessment tools had lower specificity at eight months. The high false-positive rate is attributed to transient neuromotor abnormalities and immaturity of motor function in low-birthweight infants with normal outcome.