Name

sdmainteffwo5

Label

Standard deviation of the daily sleep maintenance efficiency in workdays from actigraphy

Description

Sleep maintenance efficiency is the ratio between sleep duration (i.e. total sleep time, tst) and sleep period in main sleep. Sleep duration is the interval between sleep onset time and sleep offset time while asleep, while sleep period is the interval between sleep onset time and sleep offset time.

Units

percent (%)

Type

numeric

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	741	2.5	± 2.0	2.1	0.02	28.6	1,496	2,237
54.0 to 62.0 years	356	2.5	± 2.2	2.1	0.2	28.6	204	560
62.0 to 69.0 years	214	2.6	± 1.8	2.1	0.1	10.8	345	559
69.0 to 77.0 years	120	2.5	± 1.8	2.1	0.02	9.1	439	559
77.0 to 95.0 years	51	2.2	± 1.6	2.1	0.1	8.0	508	559

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	741	2.5	± 2.0	2.1	0.02	28.6	1,496	2,237
Female	365	2.3	± 1.7	1.9	0.02	11.3	833	1,198
Male	376	2.7	± 2.2	2.2	0.2	28.6	663	1,039

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	741	2.5	± 2.0	2.1	0.02	28.6	1,496	2,237
White, Caucasian	296	2.3	± 1.7	1.8	0.1	9.1	534	830
Chinese American	93	3.0	± 3.3	2.3	0.2	28.6	172	265
Black, African-American	188	2.8	± 1.9	2.4	0.02	11.3	428	616
Hispanic	164	2.4	± 1.6	2.2	0.2	9.8	362	526

Multi-Ethnic Study of Atherosclerosis