Box and Whisker Plot of the Distribution of Perceived Stress Scores for TMD Controls and TMD CasesThe horizontal line within the box is the median value.

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Box and Whisker Plot of the Distribution of Perceived Stress Scores for TMD Controls and TMD CasesThe horizontal line within the box is the median value while the lower and upper hinges are the 25th percentile and 75th percentile, respectively. Box and Whisker Plot of the Distribution of Perceived Stress Scores for TMD Controls and TMD CasesThe horizontal line within the box is the median value while the lower and upper hinges are the 25th percentile and 75th percentile, respectively. The ends of the whiskers represent the minimum and maximum values. A 2-group mean comparison t-test indicates the mean value for controls (19.7, s.e. 0.0) is statistically significant from that of cases (24.8, s.e. 1.2), p=0.0007. Cynthia A. Lambert et al. J Dent Hyg 2014;88:5-12 ©2014 by American Dental Hygienists Association