Figure 3.

The effect of continued daily exposure to polychromatic light, red light or withdrawal of polychromatic light on the Emotion (A), Stigma (B), Cognition (C), and Communication (D) sub-sections of the PDQ-39 is expressed as the median score for each group after 3 assessments over a 2 week period. The pre-score served as the baseline and was obtained when the study commenced and before patients were randomly assigned to their respective treatment groups. The inclusion bars show significant statistical comparisons with p-values indicating the levels of significance obtained. Statistical comparisons were made between baseline (Pre) and Week 1, Pre and Week 2 and Week 1 and Week 2. Significant levels were determined a priori with a significant effect defined as p ≤ 0.05 while trends were designated as p values ranging from 0.051 to 0.099. The star represents a significant overall effect using the Friedman's Two Way ANOVA while the inclusion bars mark significant comparisons using the Wilcoxon Signed Rank Test. The T-bars represent first quartile and third quartile values. This provides a reference point whereby the range of values around the median serves to assist in visualizing the direction of change between medians in instances where median values were equal but significantly different.