. Author manuscript; available in PMC: 2018 Nov 11.

Published in final edited form as: Behav Sleep Med. 2015 Dec 17;15(2):97–113. doi: 10.1080/15402002.2015.1104686

Table 3.

Comparison of Sleep Characteristics at Baseline Between Two Groups (Independent t-Test)

	Variables		Total (n = 22) Mean (SD)	PCDC (n = 16) Mean(SD)	Control (n = 6) Mean(SD)	p value

Sleep variables	Daytime sleep (mins)		245.67 (93.90)	241.35 (96.97)	257.19 (92.75)	.73
	% daytime on sleep (%)		34.80 (13.25)	34.40 (13.80)	35.87 (12.81)	.82
	Nighttime sleep (mins)		524.62 (67.72)	518.46 (71.56)	541.04 (58.78)	.50
	% nighttime sleep (%)		73.05 (9.56)	72.07 (10.06)	75.67 (8.33)	.45
	Arousal Index		12.75 (7.94)	13.88 (8.87)	3.75 (1.53)	.29
Variables associated withsleep	Physical activity (counts/ min)		103.98 (40.93)	108.00 (43.02)	93.25 (35.97)	.47
	Social activity (5mins/unit)		32.00 (13.90)	29.25 (13.26)	39.33 (13.95)	.13
	Daylight exposure	Mins over 1,000 Lux	21.73 (26.54)	15.85 (20.45)	45.34 (25.82)	.04
		Lux/min	276.75 (368.88)	191.50 (259.03)	504.08(533.79)	.08

Note. Social activity was measured by Dementia Care Mapping; other outcome variables were extracted from actigraphy.