Below are the authentic scale items in their original language as published in the standard psychometric validation studies, without modification or translation to preserve instrument validity and reliability:
Instructions / Directions: Freezing of gait (FOG) is defined as a brief, episodic absence or marked reduction of forward progression of the feet despite the intention to walk. If you are unsure what freezing is, you may watch a demonstration video. Please answer question 1 based on your experience over the past month. If you answer 'No', stop here. If you answer 'Yes', please answer questions 2 through 9 by selecting the category that best describes your condition.
Response Scale: Categorical screening (0 = No, 1 = Yes for Item 1) and varied ordinal response options (0 to 3 or 0 to 4) reflecting frequency, duration, and impact; total score ranges from 0 to 28.
1
Did you experience 'freezing episodes' over the past month?
2
[0] No (If no: questionnaire complete, score = 0)
3
[1] Yes (If yes: continue with questions 2-9)
4
Part II: Freezing severity
2
How often do you have freezing episodes?
3
[0] Less than once a week
4
[1] Not every day, but at least once a week
5
[2] At least once a day, but less than once an hour
6
[3] At least once an hour
3
How long does the longest freezing episode typically last?
4
[0] It never lasts longer than 1 second
5
[1] More than 1 second, but less than 5 seconds
6
[2] More than 5 seconds, but less than 30 seconds
7
[3] More than 30 seconds
4
How long does your typical start hesitation last (freezing when taking the first step)?
6
[1] Takes more than 1 second, but less than 2 seconds to start walking
7
[2] Takes more than 2 seconds, but less than 5 seconds to start walking
8
[3] Takes more than 5 seconds to start walking
5
How long does your typical turning hesitation last (freezing when turning)?
7
[1] Takes more than 1 second, but less than 2 seconds to turn
8
[2] Takes more than 2 seconds, but less than 5 seconds to turn
9
[3] Takes more than 5 seconds to turn
6
How long does your typical freezing episode last during straight walking?
8
[1] Takes more than 1 second, but less than 2 seconds
9
[2] Takes more than 2 seconds, but less than 5 seconds
10
[3] Takes more than 5 seconds
11
Part III: Freezing: impact on daily life
7
How much does freezing interfere with your daily activities (e.g., getting dressed, eating, household chores)?
8
How much does freezing affect your confidence in walking without falling?
9
How fearful are you of falling due to freezing episodes?
12
[2] Moderately fearful
