Sample Size. In accordance with the study by Ganesh et al., sample size was based on NDI scores in the patient with NP.Their study was designed to investigate the effects of MMT on NP. Large effect size was calculated for this study.Therefore, with a statistically significant level of 5%(p=0.05),a statistical power of 80%, an effect size of 0.8, and a minimum of 21 participants were required per group. Allowing for a 10% dropout rate, 47 subjects were recruited into the study.