ArticlePreventive medicine reports2026
Sleep duration, sleep-wake schedules, and social jetlag among corporate employees in Japan: Age- and gender-based comparisons of wearable device data (2019-2022).
Article in Preventive medicine reports, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
4 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Objectives: Insufficient sleep has been linked to cardiovascular events and mortality, yet most prior studies rely on self-reported sleep duration. Large-scale longitudinal studies based on objective sleep measurements remain scarce. This study aimed to describe 3-year sleep-wake patterns, including total sleep time (TST) and social jetlag, using data from a validated wearable device (Fitbit), and to compare these patterns by gender, age, weekday versus weekend, and fiscal year. Methods: The study included 20,886 corporate employees insured by Japanese health insurance associations with JMDC Inc. A total of 10,670 participants complete data contributed 5,156,835 sleep observations. Gender differences in weekday and weekend sleep were assessed using Results: Mean TST was 5.84 ( Conclusions: This study demonstrates that objectively measured TST among Japanese is shorter than self-reported estimates and varies by age and gender.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.