[Purpose] This study aimed to examine whether motor abilities of children with cerebral
palsy are related to their problematic behaviors. [Subjects] The subjects were children
with mental retardation who were undergoing physical therapy. [Methods] Twenty-one
examiners, 13 physical therapists, and 8 occupational therapists treated and examined the
subjects by using the Japanese version of the Aberrant Behavior Checklist. The Japanese
version of the Aberrant Behavior Checklist scores were compared between the Gross Motor
Function Classification System I to III (12 subjects) and Gross Motor Function
Classification System IV and V groups (17 subjects). [Results] Lethargy and stereotypy
scores significantly differed between the groups, proving that patients with Gross Motor
Function Classification System levels IV and V have more severe problematic behaviors.
[Conclusion] In this study, only five types of problematic behaviors, namely irritability,
lethargy, stereotypy, hyperactivity, and inappropriate speech, were examined. Despite this
limitation, the study clarifies that problematic behaviors of children with cerebral
palsy, except lethargy and stereotypy, have little relationship with their motor
abilities.