Advantages of a modified scoring method for the Rush Video-Based Tic Rating Scale

Area of Science:

• Neurology
• Psychiatry
• Clinical Assessment

Background:

• Previous video-based tic rating scales lacked internal domain comparison and a total score.
• These limitations hindered use as a primary outcome measure for tic disability.

Purpose of the Study:

• To evaluate a modified scoring system for a video-based tic rating scale.
• To determine if the modified system corrects limitations of the original scale, enabling internal domain comparison and a total disability score.

Main Methods:

• A modified scoring system was applied to existing tic data, rating five domains (body areas, motor/phonic frequency and severity) on a 0-4 scale.
• A total tic disability score (0-20) was calculated by summing domain scores.
• Correlations were assessed between old and new scoring systems and with the Yale Global Tic Severity Scale (YGTSS) in 31 Gilles de la Tourette syndrome patients.

Main Results:

• The new scoring system retained the rank order of scores for each individual domain compared to the original scale.
• New domain scores correlated well with comparable objective items from the YGTSS.
• The new total score accurately reflected the combined domains' rank order and correlated well with YGTSS total and overall impairment scores.

Conclusions:

• The modified videotape-based scoring system preserves the original scale's information.
• This modification enables comparisons between tic disability domains and provides a single, objective total disability score.
• The revised scale serves as a valuable primary outcome measure for tic severity in clinical research.