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Table 9 ISI Scores Before and After BLT Before Light Therapy Outcome M SD ISI Score 13.73 96.55 After Light Therapy M SD n t df 8.33 6.29 15 3.14 14 Hypothesis Three P d 0.007 1.68 A paired sample t-test was used to test the hypothesis that scores from the BDI would significantly improve over the course of light therapy. This hypothesis was supported. Results show a statistically significant difference in mean BDI scores before and after light therapy. Scores appear to decrease an average of 9.60 points following a 14-day administration of light therapy of 60 minute duration. Table 10 provides mean pre- and post-treatment scores. Table 10 BDI Scores Before and After BLT Before Light Therapy Outcome M SD BDI Score 17.33 12.66 After Light Therapy M SD n t df p d 7.73 11.31 15 3.36 14 .005 1.80 Daily morning and evening ratings of mood and anxiety were assessed through self- report measures throughout the 14-day trial of BLT. Participants were asked to rank morning and evening levels of mood on a 1-10 scale (10 indicating “mood is very high”) as well as levels of anxiety on a 1-10 scale (10 indicating “anxiety is very high”). Over the course of treatment, morning ratings of mood significantly improved by an average score of 1.29 from day 1 to day 14 (t = -2.39, p = .03). There was not a significant difference on evening ratings of mood over the course of treatment. 46PDF Image | BRIGHT LIGHT THERAPY FOR late NIGHT EATING SYNDRome
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