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extended the length and/or sample size of study considerably. Overall, this study provided an incremental contribution to the NES literature that was also feasible for a dissertation project. Table 4 Study Timeline at the Time of Project Initiation October 2012 November 2012 –August 2013 Statistical Analyses Power Analysis and Sample Size Determination August 2013 - October 2013 Study wrap up; data analysis Begin Recruitment Assess and treat 4 participants each month (N=40) Note. Study duration was extended to July 2014 to meet recruitment goals. G-power was used for the power analysis. For the power analysis, I used power of 0.80 as 2 recommendedbyCohen(1988).Todetectamediumsizedeffect(f =.15)atalpha=0.05using a paired sample t-test, a sample of 34 participants were needed. However, given this is a pilot study and effect size for light therapy is unknown, 20 participants were to be the final target sample size. I planned to recruit 40 participants in order to compensate for an estimated 50% attrition rate seen in previous NES treatment studies (Allison et al., 2008). This was planned to allow 20 participants to complete the study as outlined by the program completion criteria. Primary Aim The primary aim of this study was to determine if BLT caused a significant reduction in symptoms of night eating behavior. Descriptive statistics were used to examine the means and frequencies of the participants’ characteristics. 37PDF Image | BRIGHT LIGHT THERAPY FOR late NIGHT EATING SYNDRome
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