Name
avgfragmentation5
Label
Average daily total sleep fragmentation index in main sleep in all days 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
MESA exam number vs Average daily total sleep fragmentation index in main sleep in all days from actigraphy
N Mean StdDev Median Min Max Unknown Total
Exam 5 2,151 20.1 ± 7.0 19.0 5.3 61.7 86 2,237
Participant Age at MESA Sleep Visit vs Average daily total sleep fragmentation index in main sleep in all days from actigraphy
Exam 5
N Mean StdDev Median Min Max Unknown Total
Total 2,151 20.1 ± 7.0 19.0 5.3 61.7 86 2,237
54.0 to 62.0 years 544 19.2 ± 6.8 18.0 5.3 61.7 16 560
62.0 to 69.0 years 537 19.9 ± 6.8 19.2 5.8 56.1 22 559
69.0 to 77.0 years 532 20.6 ± 7.3 19.3 7.7 52.2 27 559
77.0 to 95.0 years 538 20.8 ± 6.9 19.7 5.3 49.6 21 559
Gender of the participant vs Average daily total sleep fragmentation index in main sleep in all days from actigraphy
Exam 5
N Mean StdDev Median Min Max Unknown Total
Total 2,151 20.1 ± 7.0 19.0 5.3 61.7 86 2,237
Female 1,155 18.6 ± 6.2 17.8 5.3 50.7 43 1,198
Male 996 21.9 ± 7.4 21.1 5.8 61.7 43 1,039
Race/ethnicity of the participant vs Average daily total sleep fragmentation index in main sleep in all days from actigraphy
Exam 5
N Mean StdDev Median Min Max Unknown Total
Total 2,151 20.1 ± 7.0 19.0 5.3 61.7 86 2,237
White, Caucasian 806 19.4 ± 7.3 17.9 5.3 61.7 24 830
Chinese American 244 19.7 ± 6.7 18.4 5.9 40.4 21 265
Black, African-American 597 21.3 ± 6.8 20.6 7.9 56.1 19 616
Hispanic 504 20.0 ± 6.5 19.0 8.1 52.0 22 526