Reliability of the Zurich Neuromotor Assessment

Reliability of measurements of timed performance and ratings of associated movements (AMs) for tasks of the Zurich Neuromotor Assessment is investigated and methods to improve it are proposed. Better results were found for timed performance than for AMs. On average, intra-rater, inter-rater, and test-retest reliability (measured via intraclass correlation) were around 0.95, 0.9, and 0.65 for timed performance, and around 0.8, 0.7, and 0.45 for AMs. Reliability can be dramatically improved by considering neuromotor components (i.e., summary measures of individual measurements obtained at different tasks) instead of single tasks, which is significant for clinical work and research.