Name

sdefficiencynw5

Label

Standard deviation of the daily sleep efficiency in non-workdays from actigraphy

Description

Sleep efficiency is the proportion of sleep duration (i.e. total sleep time, tst) in total rest period (i.e. rest interval) in main sleep. Sleep duration is the interval between sleep onset time and sleep offset time while asleep. In this study, rest interval is the same as in-bed period.

Units

percent (%)

Type

numeric

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	1,951	2.9	± 2.2	2.4	0.002	35.0	286	2,237
54.0 to 62.0 years	469	2.6	± 2.1	2.1	0.002	13.1	91	560
62.0 to 69.0 years	484	3.0	± 2.2	2.5	0.009	15.9	75	559
69.0 to 77.0 years	491	2.9	± 2.4	2.4	0.06	35.0	68	559
77.0 to 95.0 years	507	3.1	± 1.9	2.7	0.2	12.8	52	559

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	1,951	2.9	± 2.2	2.4	0.002	35.0	286	2,237
Female	1,075	2.8	± 2.1	2.4	0.009	35.0	123	1,198
Male	876	3.1	± 2.2	2.5	0.002	15.9	163	1,039

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	1,951	2.9	± 2.2	2.4	0.002	35.0	286	2,237
White, Caucasian	736	2.6	± 1.8	2.1	0.009	15.0	94	830
Chinese American	215	3.0	± 2.2	2.5	0.2	13.8	50	265
Black, African-American	548	3.3	± 2.5	2.8	0.009	35.0	68	616
Hispanic	452	3.0	± 2.1	2.5	0.002	13.9	74	526

Multi-Ethnic Study of Atherosclerosis