Statistical Analysis
The clinical and epidemiological characteristics of the patients were summarized by descriptive statistics. Data sets were described with the median and/or range. Numerical data were compared using T -test, and categorical data were compared using the χ2 test. The healing rate of tinnitus was calculated using the Kaplan–Meier method, and the log rank test evaluated differences between tinnitus healing rate distributions. Multivariable analyses were performed to analyze factors related to the outcome of tinnitus at discharge, and Cox proportional hazard models were applied to examine the healing rate with adjustments for other variables using a limited backward selection procedure. Risk ratios are presented with 95% confidence intervals. Statistical significance was defined as a two-tailed P < 0.05 for all analyses. Statistical analyses were performed using SPSS software version 23.0 and GraphPad Prism 7.0.