Table 2.

Mean and Standard Deviation (SD) of Baseline Sleep Characteristics from Wrist Actigraphy and Polysomnography

Actigraphy	Physical Activity	Non-Physical Activity
	M (SD)	M (SD)
Sleep onset latency, min	21.60 (19.5)	25.98 (18.17)
Assumed sleep, min	411.60 (41.4)	439.20 (77.4)
Actual sleep, min	355.80 (37.8)	376.80 (78.0)
Wake after sleep onset, min	61.20 (24.53)	59.74 (35.53)
Sleep efficiency, %	79.75 (9.36)	78.86 (10.14)
Fragmentation Index	34.29 I10.43)	34.17 (14.88)
Polysomnography
Sleep onset latency, min	6.20 (3.95)	8.71 (9.09)
Stage N 1, %	10.71 (4.83)	10.29 (4.44)
Stage N2,%	59.33 (8.12)	55.35 (6.64)
Stage N3, %	10.87 (8.43)	13.19 (10.18)
REM, %	19.10 (4.02)	21.17 (2.80)
Wake, %	14.69 (11.39)	11.30 (9.71)
Wake after sleep onset, min	65.40 (40.81)	55.21 (38.79)
Total sleep time, min	422.05 (58.88)	446.86 (51.29)
Sleep efficiency, %	85.87 (8.39)	86.67 (8.87)
Arousal index	12.95 (5.56)	13.16 (8.31)

Note: p>.1 for all comparisons between physical activity groups for all baseline objective sleep characteristics.