Table 3. Paired samples tests of SEMG median frequency of the cervical muscles recorded showing mean and their standard error mean, lower and upper 95% confidence interval of the difference, t statistic (degree of freedom: 43) and significance. Direction Mean (Hz) SE means (Hz) t 95 %CI p E 35.5 .43 43 34.6 – 36.4 .001 RPO 33.3 .39 84.5 32.6 – 34.1 .001 RLF 60.7 .55 111.3 59.6 – 61.8 .001 RAO 60.1 .49 122.8 59.1 – 61.1 .001 LPO 32.8 .32 103.6 32.1 – 33.4 .001 LLF 28.1 .25 112.9 27.6 – 28.6 .001 LAO 27.7 .19 142.4 27.3 – 28.1 .001 F 27.6 .17 159.2 26.9 – 27.6 .001 Bonferroni correction for eight situations set significance at less than 0.0018.