Name

avgfragmentationnw5

Label

Average daily total sleep fragmentation index in main sleep in non-workdays from actigraphy

Description

Sleep Fragmentation is an index of restlessness during the sleep period expressed as a percentage. Kristen L et al. 2011 (PubMed ID:21411507)

There are three type of measures for sleep fragmentation: movement Index (MI), fragmentation index (FI), and total sleep fragmentation Index. The fragmentation index refers to the percentage of 60?s periods of sleep out of the total number of periods of immobility. The movement index refers to the total of scored awake minutes divided by sleep period (i.e. total time in bed). The total sleep fragmentation index is the sum of FI and MI. (ActiGraph validation reference)[https://actigraphcorp.force.com/support/s/article/Sleep-Fragmentation-Index-Validation-Reference]

Units

percent (%)

Type

numeric

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	2,077	20.1	± 7.2	19.2	0.09	55.7	160	2,237
54.0 to 62.0 years	519	19.4	± 7.3	18.3	4.5	51.8	41	560
62.0 to 69.0 years	521	19.7	± 7.0	18.6	0.09	55.7	38	559
69.0 to 77.0 years	514	20.5	± 7.6	19.3	3.5	52.2	45	559
77.0 to 95.0 years	523	20.8	± 6.9	20.0	4.8	49.6	36	559

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	2,077	20.1	± 7.2	19.2	0.09	55.7	160	2,237
Female	1,123	18.6	± 6.5	17.8	0.09	55.7	75	1,198
Male	954	21.9	± 7.6	21.1	1.5	53.7	85	1,039

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	2,077	20.1	± 7.2	19.2	0.09	55.7	160	2,237
White, Caucasian	776	19.5	± 7.6	18.5	0.09	55.7	54	830
Chinese American	236	19.4	± 7.1	18.2	5.9	39.5	29	265
Black, African-American	581	21.2	± 7.1	20.5	1.5	53.7	35	616
Hispanic	484	20.1	± 6.7	19.0	5.5	52.5	42	526

Multi-Ethnic Study of Atherosclerosis