STATISTICAL ANALYSIS
±, SD
Data were analyzed using SPSS version 18 (SPSS Inc, Chicago, Ill, USA). Descriptive statistics were used to summarize continuous data, whereas frequency and percentage were used to characterize categorical variables. For all of the outcome variables, descriptive statistics were computed and represented as mean ± SD or median and range, as applicable. The effects of add‐on melatonin versus placebo were compared using the independent 