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Chapter 6
Figure 3 Examples of MRI slices with T2 measurements of (from top left to bottom right) the masseter, lateral pterygoid, medial pterygoid, intrinsic tongue, extrinsic tongue, suprahyoid, infrahyoid, sternocleidomastoid and superior pharyngeal constrictor muscles. White circles delineate the region of interests.
Statistical analysis
Analyses were performed using IBM® SPSS® Statistics 22.0 (40). Inter-rater reliability was assessed by means of the average measures Intra-Class Coefficient (ICC) from a two-way mixed model using a consistency definition. Median T2-values of the selected ROI of the included muscles at rest and after exercise (six measurements per muscle) were compared by means of the Wilcoxon signed rank test. Based on this test, an accompanying r-type effect size was calculated to provide a standardized measure of strength of the effect. Following the guidelines of Cohen (41), the r-type effect sizes of 0.1 were considered small, 0.3 moderate, and 0.5 large. Large effect sizes (r > 0.5) were considered indicative of meaningful observations.