This study aimed to identify the factors contributing to freezing of gait (FOG). [Subjects and Methods] The
participants included 28 adults with PD. Principal component analysis was used to investigate the characteristics of
The major variables of the first principal component in 14 FOG situations were unfamiliar places, unpredictable
schedule changes, entering an automatic door, when another person suddenly crossed, and change in the
walking surface. These situations were unrelated to the second principal component. Getting on/off a public transport
and crowded places were major variables for the second principal component, and related to both the first and
second principal components. Although fatigue was the most frequent FOG situation, not all principal components
were influenced. The values of the PD Questionnaire-39 revealed significant differences between the groups.