Table 1.

Mean differences tested by the Mann-Whitney U test.

Characteristics		Nondepression group (n=29), mean (SD)	Depression group (n=18), mean (SD)	Differences, mean (SD)	P value
Ecological momentary assessment		6.6 (1.55)	5.1 (1.64)	−1.5 (1.58)	.004
Activity (counts)		90.5 (32.76)	67.4 (18.82)	−23.1 (28.31)	.003
Light exposure (lux)
	White	54.0 (36.54)	81.5 (39.98)	27.5 (37.88)	.008
	Red	69.9 (54.12)	103.6 (63.95)	33.7 (58.03)	.03
	Green	60.1 (43.09)	99.9 (55.35)	39.8 (48.09)	.005
	Blue	38.9 (28.84)	62.0 (34.33)	23.1 (31.03)	.006