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Population study: followed a group

Study of 46 adults with lung scarring: more steps linked to lower death risk

Bahmer and colleagues · BMC pulmonary medicine · 2017

Original title: Prognosis and longitudinal changes of physical activity in idiopathic pulmonary fibrosis.

Under review. A person has not yet checked this summary against the paper. It is written from the PubMed abstract. Until a person checks it, search engines are asked not to list this page.

What the study found

Points to benefit

20 of 46 died. Each standard deviation more steps a day went with a more than halved risk of death (HR < 0.50). Steps fell by 973 a day each year in survivors.

The study at a glance

Type of study
Population study: followed a group
Who or what was studied
46 people · Adults with lung scarring disease (IPF), average age 67
What was tested
Counted steps a day with a sensor, then tracked survival for 3 years
What it measured
The question itself: death from any cause
Who has a stake
No stake declared
No competing interests declared.
Journal
BMC pulmonary medicine, 2017
Source
PubMed record 28743305. 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.
  • •46 people.
  • ✓Measured the question itself: death from any cause.
  • ✓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 from any cause

    0

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

  2. Trials in people: other measures

    0

    None among the papers we read.

  3. Trials in people: lab tests or safety

    0

    None among the papers we read.

  4. Population studies

    10

    9 benefit, 1 no difference

    ↑ This study is the ringed dot

  5. Blood levels and genes

    0

    None among the papers we read.

↓ 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 many steps a day lower the risk of early death?”

About 6,000 to 10,000 steps; fewer if older.

Confidence: low. Based on 17 on-topic papers.

Read the full answer

Of the other 9 papers on the same step: 8 benefit, 1 no difference. This one found benefit. It agrees with most of them.

Other papers on the same step

See all 17 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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