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Wave 1

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Improvement in sleep duration was associated with higher cognitive ... aging-us.com Aging Oct 20, 2020 22 facts

measurementThe mean score for the Long Sleep Duration (LSD) group at Wave 1 was 8.19 with a standard deviation of 4.58.

measurementIn Wave 1 of the China Health and Retirement Longitudinal Study (CHARLS), the mean age of all participants was 59.1 ± 9.8 years.

measurementThe CHARLS study selected approximately 17,000 individuals randomly from 150 counties/districts and 450 villages/resident committees for Wave 1, with baseline data collected between June 2011 and March 2012.

claimAmong participants who were moderate sleepers (6-8 hours) at baseline (Wave 1), increasing or decreasing sleep duration by 2 or more hours by Wave 2 was associated with lower global cognition scores compared to participants who did not change their sleep duration.

measurementIn a study of participants who slept 7 hours or more in Wave 1, higher sleep duration was associated with lower scores in global cognition (β=-0.47, P<0.001 for model 1; β=-0.28, P<0.001 for model 2) and on all three cognitive tests.

measurementIn Wave 1 of the China Health and Retirement Longitudinal Study (CHARLS), the mean nocturnal sleep duration of participants was 6.4 ± 1.9 hours per night.

claimFor participants identified as short sleepers (sleeping <6 hours) in Wave 1, a change in sleep duration of 2 or more hours in Wave 2 or Wave 3 was associated with lower global cognition scores.

measurementShort sleepers in Wave 1 demonstrated lower scores in the specific cognitive domains of episodic memory, figure drawing, and the Telephone Interview of Cognitive Status (TICS) compared to moderate sleepers.

measurementLong sleepers, defined as those sleeping more than 8 hours per night in Wave 1, had lower global cognition scores compared to moderate sleepers (6-8 hours) in the study.

measurementIn Wave 1 of the China Health and Retirement Longitudinal Study (CHARLS), 73.3% of the participants attended primary school and above.

measurementParticipants who slept 6-8 hours per night in Wave 1 exhibited the highest global cognition scores in the study.

measurementThe study categorized 15,216 participants into three sleep duration groups in Wave 1: less than 6 hours (n=4,453), 6 to 8 hours (n=9,508), and greater than 8 hours (n=1,255).

measurementShort sleepers, defined as those sleeping less than 6 hours per night in Wave 1, had lower global cognition scores compared to moderate sleepers (6-8 hours) in the study.

measurementIn the CHARLS study, 15,700 participants had data on sleep duration and cognitive tests in 2011 (Wave 1), from which 104 individuals under 45 years old and 380 individuals with a history of brain damage or mental retardation were excluded.

measurementIn the CHARLS longitudinal cohort study, 15.9% of participants from Wave 1 were lost to follow-up in Wave 2, and 19.4% were lost to follow-up in Wave 3.

measurementIn the study, 8.2% of participants were in the long sleep duration (LSD) group at baseline, and 0.6% of participants remained in the LSD group from Wave 1 to Wave 3.

claimThe study titled 'Improvement in sleep duration was associated with higher cognitive...' identified an inverted-U shaped association between sleep duration and global cognition scores in Wave 1, as visualized by generalized additive models.

claimIn the study analysis of changes from Wave 1 to Wave 3, changes in sleep duration were associated with global cognition scores, with the association remaining significant for episodic memory and TICS tests in models 2 and 3, but not for the figure-drawing test.

measurementIn a study of participants who slept 7 hours or less in Wave 1, shorter sleep duration was associated with lower scores in global cognition (β=0.48, P<0.001 for model 1; β=0.28, P<0.001 for model 2) and on all three cognitive tests.

claimFor participants identified as long sleepers in Wave 1, changes in sleep duration had no significant effect on global cognition scores.

measurementIn Wave 1 of the China Health and Retirement Longitudinal Study (CHARLS), 47.3% of the participants were male, 76.5% were from rural areas, and 88.0% were married.

measurementThe study included 232 subjects in the Long Sleep Duration (LSD) group at Wave 1.