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.