Statistical AnalysisDescriptive 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. Percent strength deficit on the side of neck pain was determined by subtracting lower trapezius strength on the ipsilateral side from lower trapezius strength on the contralateral side and dividing the result by lower trapezius strength on the contralateral side. The correlation coefficient for NPQ score and percent strength deficit was calculated using a Pearson correlation analysis. The correlation coefficient for symptom duration and percent strength deficit was also calculated. A chi-square test was used to determine if an association existed between side of hand dominance and side of the stronger lower trapezius muscle. A significance level of P<.05 was selected for this study. All statistical analysis was performed with GraphPad Prism, Version 4 (Graph- Pad Software, Inc, San Diego, CA) and custom software written in LabVIEW programming language.
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