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Population study: followed a group

Follow-up study of 1,360 adults with diabetes: more sleep linked to less heart disease

Jin and colleagues · PloS one · 2025

Original title: Sleep duration and cardiovascular disease risk in type 2 diabetes: A prospective cohort study.

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What the study found

Points to benefit

Each extra hour of sleep was tied to lower heart disease risk (OR: 0.92, 95% CI: 0.86-0.99). Sleep over 9 h had OR: 0.36 (95% CI: 0.15-0.85) versus shorter sleep.

The study at a glance

Type of study
Population study: followed a group
Who or what was studied
1,360 people · Chinese adults with type 2 diabetes in a national aging study
What was tested
Sleep hours (average 6.45) and long sleep over 9 h vs shorter, then new heart disease, stroke or heart failure
What it measured
The question itself: death, heart disease and other health outcomes
How long
156 weeks
Who has a stake
No stake declared
No conflicts of interest declared.
Journal
PloS one, 2025
Source
PubMed record 41252410. This page is based on the abstract only.

How much this study counts

  • –Shows a link, not a cause: people chose their own habits, and other differences between them may explain the result.
  • ✓Followed people over time, so habits were recorded before the outcome happened.
  • •1,360 people.
  • ✓Measured the question itself: death, heart disease and other health outcomes.
  • ✓No competing interests declared.
  • •Summarized from the PubMed abstract only. The full paper may hold details the abstract leaves out.

✓ Strength– Limit• Note

These points come from fixed rules about the type of study, its size and length, what it measured, and who has a stake. Every study on Digestery gets the same rules.

Where this study sits

Each dot is one on-topic paper on this question. Steps near the top answer the question more directly.

↑ Stronger evidence

  1. Trials in people: death and chronic disease

    0

    Not done yet. This is the step that would answer the question.

  2. Trials in people: other measures

    1

    1 benefit

  3. Trials in people: lab tests or safety

    0

    None among the papers we read.

  4. Population studies

    11

    5 benefit, 4 mixed, 2 no difference

    ↑ This study is the ringed dot

  5. Blood levels and genes

    1

    1 benefit

↓ Weaker evidence

  • Points to benefit
  • Mixed
  • No difference
  • No direction
  • Points to harm

How it fits with the other research

The short answer to “How much sleep do adults need for good health?”

Lowest risk at about 7 hours.

Confidence: low. Based on 22 on-topic papers.

Read the full answer

Of the other 10 papers on the same step: 4 benefit, 4 mixed, 2 no difference. This one found benefit.

Other papers on the same step

See all 22 studies on this question

How this page was made

Label

First read of the abstract
Claude Sonnet
Independent second read
Claude Haiku
Differences settled
The two reads agreed on every checked field. Claude Opus 5.5.
Headline
Claude Sonnet, from the checked study record. A script checked its numbers and wording.
Numbers
Checked against the abstract by a script
“How much this study counts”
Fixed rules, the same for every study
Source check by a person
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