Which GMFM version is validated for CP and Down syndrome?

Which GMFM version is validated for CP and Down syndrome?

• A. GMFM-66
• B. GMFM-88
• C. GMFM-66 and GMFM-88
• D. None

Answer: (B)

The key idea is that validity across different conditions matters when choosing a GMFM version. The 88-item GMFM has been studied and validated in both cerebral palsy and Down syndrome populations, providing robust measurement across a wider range of motor abilities and developmental profiles. This broader validation means it can more reliably capture functional changes in children with Down syndrome, including those who may not progress along the same CP-focused patterns. The shortened 66-item version is derived from the 88-item version and is widely used for cerebral palsy because of its efficient scoring and strong CP-specific psychometrics. However, its validation evidence in Down syndrome is not as established, so it’s not the preferred choice when Down syndrome is part of the clinical picture. Therefore, the best answer is the 88-item GMFM, since it has documented validity for both cerebral palsy and Down syndrome, making it appropriate for use in mixed populations or when Down syndrome is a factor.

The key idea is that validity across different conditions matters when choosing a GMFM version. The 88-item GMFM has been studied and validated in both cerebral palsy and Down syndrome populations, providing robust measurement across a wider range of motor abilities and developmental profiles. This broader validation means it can more reliably capture functional changes in children with Down syndrome, including those who may not progress along the same CP-focused patterns.

The shortened 66-item version is derived from the 88-item version and is widely used for cerebral palsy because of its efficient scoring and strong CP-specific psychometrics. However, its validation evidence in Down syndrome is not as established, so it’s not the preferred choice when Down syndrome is part of the clinical picture.

Therefore, the best answer is the 88-item GMFM, since it has documented validity for both cerebral palsy and Down syndrome, making it appropriate for use in mixed populations or when Down syndrome is a factor.