Measurement properties of the Dynavision D2 one-minute drill task in active adolescents
ObjectiveThe purpose of this study was to evaluate test-retest reliability and practice effects of the Dynavision D2 in active adolescents.BackgroundFollowing sport-related concussion, assessment of oculomotor function and vision is important. While clinical tests are recommended, computerized devices, such as the Dynavision D2, are emerging as viable tools for vision assessment. As with all concussion assessments, understanding test-retest reliability and susceptibility to practice effects is important for appropriate interpretation of serial assessments post-injury.Design/methodsParticipants included 20 female adolescents (age = 16.6 ± 1.10 years, mass = 62.0 ± 5.9 kg, height = 169.2 ± 5.1 cm). Participants completed 2 test sessions 1 week apart using the Dynavision D2. The Dynavision D2 includes a one-minute drill task where a single light illuminates, and participants hit the light as quickly as possible, completing 3 drills per trial. Participants completed 3 trials during the first session and 2 during the second. Independent variables were day (day 1, day 2) and drills (15 drills). Dependent variables were the number of hits per minute (Hits/min) and average reaction time (AvgRT). Within-day and between-day test-retest reliabilities were analyzed using two-way random effects intraclass correlation coefficients for consistency. Practice effects were analyzed with repeated measures analysis of variance and Helmert contrasts (p = 0=.05).ResultsModerate-to-strong reliability was demonstrated for Hits/min (within-day 1 [ICC = 0.74; 95% CI: 0.53, 0.87]; within-day 2 [ICC = 0.91; 95% CI. 77.97]; between-days [ICC = 0.86; 95% CI. 65.95]). Moderate-to-strong reliability was demonstrated for AvgRT (within-day 1 [ICC = 0.70, 95% CI. 48.86], within-day 2 [ICC = 0.92; 95% CI. 78.97]; between-days [ICC = 0.85; 95% CI: 0.64.94]). Practice effects were noted for Hits/Min (p = 0.001) and AvgRT (p < 0.001). Helmert contrasts suggested that the practice effect plateaued at drill 11 for Hits/min and drill 12 for AvgRT.ConclusionsModerate-to-excellent test-retest reliability was found for the one-minute task drill with better reliability noted on day 2 and between days, compared to day 1. This task is susceptible to practice effects, highlighting the need for familiarization or practice trials prior to documenting patient scores.