2.4|Statistical Analysis
The statistical analyses were performed using SPSS for Windows, version 22 (SPSS Inc, Chicago, IL, USA). The selection of subjects for non-LVAS group was performed by PSM method by matching the gender, age and hearing threshold at the ratio of 1:1. Continuous variables were expressed as the mean ± SD or median (IQR) and categorical values were shown in the form of n (%). For continuous variables, one-sample T-test, single-sample T-test, and ANOVA were used for normally distributed data and Mann–Whitney U test for non-normally distributed data. For categorical variables, chi square test and Fisher’s exact test were used. Multivariate linear regression was performed to assess the relative contributions of corresponding variables to Gesell developments. p <.05 was considered statistically significant.