@article{ref1,
title="Association between nighttime sleep duration, sleep timing and falls among middle-aged and older Chinese population: A cross-sectional analysis from the Dongfeng-Tongji cohort study, China",
journal="Geriatrics and gerontology international",
year="2017",
author="Wang, Yi and Li, Wending and Shen, Lijun and Song, Lulu and Li, Hui and Liu, Bingqing and Yuan, Jing and Wang, Youjie",
volume="17",
number="11",
pages="1886-1892",
abstract="AIM: To examine the association between nighttime sleep duration, sleep timing, and their interactive effect on falls among middle-aged and older Chinese adults. <br><br>METHODS: The study sample of 35,465 (mean age 64.5 years) subjects were from the Dongfeng-Tongji cohort. All subjects completed baseline questionnaires and medical examinations. Participants were classified into five groups based on nighttime sleep duration: <7 h, 7- ≤ 8 h, 8- ≤ 9 h, 9- ≤ 10 h, ≥10 h, and three groups based on sleep timing: <21:00, 21:00- ≤ 23:00, ≥23:00. Logistic regression models estimated the odds ratios (ORs) of nighttime sleep duration/timing with single/recurrent falls. <br><br>RESULTS: The one year rate of falls was 15.2 % among the subjects. After adjusting for potential confounders, participants with longer sleep duration (≥10 h) had 1.48 times (95 % confidence interval [CI], 1.11-1.97) higher odds of recurrent falls, compared with those sleeping 7- ≤ 8 h. Earlier (<21:00) and later (≥23:00) sleep timing were associated with recurrent falls (earlier: OR 1.90, 95 % CI 1.33-2.73; later: OR 1.33, 95 % CI 1.14-1.56) compared with a normal sleep schedule (sleep during 21:00- ≤ 23:00). The combined effect showed that longer sleep duration and earlier sleep timing were associated with a greater occurrence of falls (OR 1.66, 95 % CI 1.22-2.26). <br><br>CONCLUSIONS: Long nighttime sleep duration was associated with a higher occurrence of recurrent falls but not with a single fall. Long sleep duration with early timing greatly increased both single and recurrent falls. Geriatr Gerontol Int 2017; ••: ••-••.<br><br>© 2017 Japan Geriatrics Society.<p /> <p>Language: en</p>",
language="en",
issn="1444-1586",
doi="10.1111/ggi.12984",
url="http://dx.doi.org/10.1111/ggi.12984"
}