2.5 | Statistical Analysis
Statistical comparisons of clinical characteristics between SBASSR group and WASSR group were based on independent t -test, Mann-WhitneyU test, Chi-square test, and Fisher’s exact test. Hearing outcome was compared between SBASSR group and WASSR group at baseline, one-week follow-up assessment, and last follow-up assessment. A two-way analysis of variance (ANOVA) was conducted that examined the effects of group and follow-up assessment on hearing outcome. Post hoc testing using the Sidak’s multiple comparisons test was used to compare the hearing outcome between two groups. Multivariate logistic regression models were performed with backward selection to assess the independent association of ASSR group and hearing recovery. Clinical factors found to have possible association in univariate analysis (p < 0.20) were entered into the multivariate logistic regression analysis model. All statistical analyses were performed using SPSS software (ver. 18.0, SPSS Inc., Chicago, IL, USA) and p -values less than 0.05 were considered statistically significant.