Statistical analyses
sore throat
SORE THROAT
Statistical analyses were performed using Statistical Package for the Social Sciences (version 24, IBM Corp, Armonk, NY, USA). The sample size was calculated from a pilot study, wherein the severity of sore throat 3 h postoperatively (mean ± standard deviation) was 20.5 ± 11.6 and 11.6 ± 11.0 in Groups C and S, respectively (n = 6 per group). A two-tailed α value of 0.05 and a power of 80% were assumed; the required sample size was determined to be 56 (28 per group) to assess the severity of sore throat 3 h postoperatively and demonstrate a statistically significant difference between the two groups (effect size = 0.79). Thus, assuming potential dropouts, a target sample size of 33 patients per group was planned. None of the patients in the pilot study was included in the present study.To present demographic data and target measurements, descriptive statistics were used. To compare the demographic data, time measurement, and amount of IV-PCA used, an independent Student’s 