Statistical Analysis
Descriptive statistics for gender, age symptom duration, NPQ score, side of symptoms, and handedness were calculated. A 2-way, random-model (2,1) intraclass correlation coefficient (ICC) was used to determine between-trial intrarater reliability for both extremities. Standard error of measurement (SEM) was calculated using the formula SEM = SD (1−ICC). A dependent t test was used to detect differences betweenlower trapezius strength on the side ipsilateral to neck pain and lower trapezius strength on the side contralateral to neck pain.