Improvement in Fatigue, Sleepiness, and Health-Related Quality of Life with Bright Light Treatment in Persons with Seasonal Affective Disorder and Subsyndromal SAD

Table 2

Mean values (SD) for the cluster variables in the three clusters at baseline (𝑁=49).

Cluster variables	Winter fatigue
	Mildly depr/Not Sleepy	Mildly depr/Sleepy	Depressed/Sleepy	Between-groups ANOVA
	𝑁=9	𝑁=23	𝑛=17	𝐹(2,48)	P value
HAMD-21 (SD)	12.9 (4.1)	11.4 (5.0)	20.4 (6.2)	14.7	<.001
Atyp-8 (SD)	6.9 (2.8)	6.3 (2.7)	12.3 (2.6)	26.3	<.001
FQ (SD)	16.9 (2.1)	17.7 (4.2)	23.4 (1.8)	18.8	<.001
ESS (SD)	3.8 (2.2)	11.7 (3.1)	11.5 (2.6)	28.7	<.001