Gross Motor Ability Estimator (GMAE)
The Gross Motor Ability Estimator (GMAE) is a software package that provides an improved method of scoring the GMFM for children with cerebral palsy. This new scoring system was developed from the results of a Rasch analysis of a sample of 537 children across Ontario with a diagnosis of cerebral palsy and uses the scores of 66 of the original 88 items.
The GMAE provides an interval-level measure of gross motor function based on a child's scores on the items of the GMFM. Because the GMAE was calibrated on a sample of children with cerebral palsy it is valid only for this population and cannot be used for any other population of children (Down syndrome, acquired brain injury, etc.)
The GMAE computer program is required to score the GMFM-66. The program is on CD and comes with the "Gross Motor Function Measure (GMFM-66 and GMFM-88) Users' Manual".
Journal articles:
Improved scaling of the Gross Motor Function Measure for children with cerebral palsy: evidence of reliability and validity