Statistical Analysis
Using ISI as the main outcome and intervention and control group allocated as 1:1, the difference in ISI improvement after treatment (DCBT-I vs controls) was estimated to be approximately 6 with an SD of approximately 8. Based on previous literature,SPSS Statistics for Windows, version 23 (IBM) was used for statistical analysis. The main outcome indicators were analyzed using the intention-to-treat (ITT) principle. The full analysis data set was defined as patients who completed at least 6 weeks of intervention. Missing ISI values were replaced by Linear Interpolation. Continuous data were expressed as mean and SD, and an independent samples 