Table 1.

Summary of analysis of variance (repeated measures ANOVA) for GFA.

Within-subjects effects
Interaction
Source	Brain areas	Type III sum of squares	Mean square	F(1, 24)	Significance (GFA)
Time (pre and post) × group (ALT/BLT) (sphericity assumed)	Splenium of CC	0.000	0.000	6.151	0.021*
Pairwise comparisons (pre versus post)
Effect of treatment	Brain areas	Groups	F(1, 24)		Significance (GFA)
Pre versus post	Splenium of CC	ALT	1.511		0.231
		BLT	5.619		0.026**

GFA, generalized fractional anisotropy; BLT, blue-light therapy; ALT, amber-light therapy; CC, corpus callosum.

*Interaction is significant at p < 0.05.

**Mean difference between post- and pre-treatment is significant at p < 0.05.