OBJECTIVE: We examined the short- and long-term temporal stability of tic counts to estimate the minimum length of videotape needed for a reliable index of overall tic activity and determined the interrater reliability and validity of tic counts based on prolonged videotape segments (> 10 minutes). METHOD: Motor and phonic tic counts and clinician ratings were performed on 43 patients with Tourette's syndrome (TS), aged 7 to 50 years. Short-term stability was estimated by determining the mean interval-to-interval correlation of sequential equal-length segments from 30-minute videotape recordings of 20 subjects. Long-term stability was determined by correlating tic counts at 1-week (N = 14) and 2-week intervals (N = 11). In addition, tic counts were correlated with the most widely used clinical ratings of TS. RESULTS: The short-term stability data indicated that estimates of motor and phonic tic frequencies should be based on videotape counts of at least 5 minutes' duration. Tic counts also were highly reliable and were significantly correlated with clinical ratings with the Yale Global Tic Severity Scale and the Clinical Global Impression Scale for Tourette Syndrome. CONCLUSIONS: Standardized videotape tic counts can provide highly reliable, stable measures of tic frequencies that are moderately correlated with selected global ratings of tic severity.
OBJECTIVE: We examined the short- and long-term temporal stability of tic counts to estimate the minimum length of videotape needed for a reliable index of overall tic activity and determined the interrater reliability and validity of tic counts based on prolonged videotape segments (> 10 minutes). METHOD: Motor and phonic tic counts and clinician ratings were performed on 43 patients with Tourette's syndrome (TS), aged 7 to 50 years. Short-term stability was estimated by determining the mean interval-to-interval correlation of sequential equal-length segments from 30-minute videotape recordings of 20 subjects. Long-term stability was determined by correlating tic counts at 1-week (N = 14) and 2-week intervals (N = 11). In addition, tic counts were correlated with the most widely used clinical ratings of TS. RESULTS: The short-term stability data indicated that estimates of motor and phonic tic frequencies should be based on videotape counts of at least 5 minutes' duration. Tic counts also were highly reliable and were significantly correlated with clinical ratings with the Yale Global Tic Severity Scale and the Clinical Global Impression Scale for Tourette Syndrome. CONCLUSIONS: Standardized videotape tic counts can provide highly reliable, stable measures of tic frequencies that are moderately correlated with selected global ratings of tic severity.
Authors: Joseph F McGuire; Brittany B Kugler; Jennifer M Park; Betty Horng; Adam B Lewin; Tanya K Murphy; Eric A Storch Journal: Child Psychiatry Hum Dev Date: 2012-12
Authors: John Piacentini; Michael B Himle; Susanna Chang; David E Baruch; Brian A Buzzella; Amanda Pearlman; Douglas W Woods Journal: J Abnorm Child Psychol Date: 2006-10
Authors: Michael B Himle; Susanna Chang; Douglas W Woods; Amanda Pearlman; Brian Buzzella; Liviu Bunaciu; John C Piacentini Journal: J Appl Behav Anal Date: 2006
Authors: Danielle C Cath; Tammy Hedderly; Andrea G Ludolph; Jeremy S Stern; Tara Murphy; Andreas Hartmann; Virginie Czernecki; Mary May Robertson; Davide Martino; A Munchau; R Rizzo Journal: Eur Child Adolesc Psychiatry Date: 2011-04 Impact factor: 4.785