Statistical analyses
SPSS version.21.0 (SPSS Inc., Chicago, IL, USA) was used for statistical analysis. The mean ± standard deviation or percentage (%) was used to present the demographic and clinical data. The t-test for independent samples was used to make comparisons between the training patients and controls. For categorical data, Pearson’s chi-square test was applied. Paired t-test was used to compare olfactory function in each group at baseline and 12 weeks afterwards. Univariable linear regression analysis was performed to investigate the relationship between changes in TDI scores and age, sex, duration of disease, the severity of OD, LM score, and OT. Factors with a p-value of <0.1 were subjected to multivariable linear regression analysis. Multivariable linear regression analysis was performed to investigate the relationship between changes in TDI scores and sex, the severity of OD, and OT.