Name

avgfragmentationwo5

Label

Average daily total sleep fragmentation index in main sleep in 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	831	19.8	± 7.8	18.5	3.4	65.7	1,406	2,237
54.0 to 62.0 years	382	19.1	± 7.9	17.5	3.7	65.7	178	560
62.0 to 69.0 years	239	20.5	± 8.2	19.4	3.4	57.9	320	559
69.0 to 77.0 years	143	20.6	± 7.2	19.7	4.2	42.0	416	559
77.0 to 95.0 years	67	19.7	± 7.1	18.5	4.8	37.3	492	559

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	831	19.8	± 7.8	18.5	3.4	65.7	1,406	2,237
Female	410	18.4	± 7.4	17.4	3.4	54.0	788	1,198
Male	421	21.1	± 8.0	20.2	5.7	65.7	618	1,039

	N	Mean	StdDev	Median	Min	Max	Unknown	Total
Total	831	19.8	± 7.8	18.5	3.4	65.7	1,406	2,237
White, Caucasian	333	19.0	± 8.6	17.3	3.4	65.7	497	830
Chinese American	105	20.4	± 7.0	19.4	6.7	40.7	160	265
Black, African-American	213	21.2	± 7.6	20.4	3.7	57.9	403	616
Hispanic	180	19.3	± 6.7	18.9	5.7	45.4	346	526

Multi-Ethnic Study of Atherosclerosis