Name

sdefficiencywd5

Label

Standard deviation of the daily sleep efficiency in weekdays 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	2,150	3.0	± 2.0	2.5	0.1	29.3	87	2,237
54.0 to 62.0 years	544	2.9	± 2.1	2.5	0.5	29.3	16	560
62.0 to 69.0 years	537	3.0	± 2.1	2.4	0.2	15.9	22	559
69.0 to 77.0 years	531	2.9	± 1.9	2.4	0.1	15.2	28	559
77.0 to 95.0 years	538	3.1	± 2.0	2.6	0.1	14.3	21	559

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	2,150	3.0	± 2.0	2.5	0.1	29.3	87	2,237
Female	1,155	2.8	± 1.7	2.4	0.2	14.3	43	1,198
Male	995	3.2	± 2.3	2.6	0.1	29.3	44	1,039

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	2,150	3.0	± 2.0	2.5	0.1	29.3	87	2,237
White, Caucasian	806	2.7	± 1.8	2.2	0.1	15.2	24	830
Chinese American	244	3.2	± 2.7	2.5	0.3	29.3	21	265
Black, African-American	597	3.3	± 2.1	2.9	0.1	15.9	19	616
Hispanic	503	3.0	± 1.9	2.5	0.3	11.2	23	526

Multi-Ethnic Study of Atherosclerosis