Improvement in Fatigue, Sleepiness, and Health-Related Quality of Life with Bright Light Treatment in Persons with Seasonal Affective Disorder and Subsyndromal SAD
Figure 2
The box plots (a)–(e) illustrate results from ANOVA repeated measures analysis of the clusters/subgroups at baseline, posttreatment, and one-month followup. A reference (horizontal) line is given for each measure; the fatigue questionnaire (FQ), a population mean set at 12.2 [25] and the Epworth Sleepiness Scale (ESS), a cutoff for excessive daytime sleepiness set at ≥10 [26]. Two reference lines are given for the 29-item SIGH-SAD/SR depression scale, one representing scores for individuals without depressive symptoms set at ≤8 [31] and the other indicating possible depression set at ≥20 [32]. The reference lines for the SF-36 PCS (physical component summary scale) and MCS (mental component summary scale) represent mean values for the general population set at 50 [27].
