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Hours spent sitting and the risk of dying

Sitting is the quiet one. Each daily hour added a little risk, and past about 8 hours it climbed faster, even for people who exercise.

Where you stand

Patterson 2018 pooled 34 studies. One cohort also found that how long each sitting stretch runs predicts risk on its own, not just the daily total.

Each row is one study of death risk from sedentary time. The bright line is what that study found. The band around it is the range the data still supports — it fades where the evidence thins. Left of the centre line is lower risk.

what the study foundstill plausibleno change
Two groups compared
the whole gap between a high and a low
higher vs lower self-reported sedentary time (pooled across 13 heterogeneous studies, adjusted for physical activity)
Biswas A, Oh PI, Faulkner GE, Bajaj RR, Silver MA, Mitchell MS, Alter DA. 2015
24% higher
range 9–41% higher
One step at a time
what each single increase is worth
each additional 1 h/day sitting, above an 8 h/day threshold
Patterson R, McNamara E, Tainio M, de Sá TH, Smith AD, Sharp SJ, Edwards P, Woodcock J, Brage S, Wijndaele K. 2018
4% higher
range 3–5% higher

What it is

Hours spent sitting in a typical day — at a desk, in a car, on a couch. This is total sitting time. One study on this page found how long each sitting stretch runs also predicts risk, independent of the total — a single "hours/day" number like this one can't capture that.

How it is modeled (not scored)

Technical notes

The curve is Patterson 2018: physical-activity-adjusted dose-response meta-analysis, 34 studies, 1,331,468 people. All-cause mortality RR per 1 h/day is 1.01 (1.00–1.01) up to an 8 h/day threshold, then steepens to 1.04 (1.03–1.05) per 1 h/day beyond it — risk climbs faster once daily sitting exceeds about 8 h/day, independent of exercise. Not in your score: Ekelund 2016 (PMID 27475271, 1,005,791 people) found more than 8 h/day of sitting carried no increased risk in the most active quarter (HR 1.04, 0.99–1.10), and Stamatakis 2019 (PMID 31023430, 149,077 people) found the association attenuated or effectively eliminated at guideline-level activity, so a free-standing sitting score would double-count steps and penalize active desk workers; it also cannot be framed as something to do. Main source: Patterson. Supporting: Ekelund 2019 BMJ (device-measured quarters, quarter 4 (most sedentary) HR 2.63 (1.94–3.56) vs quarter 1, a steeper accelerometer-quarter shape than Patterson's continuous hours) / Biswas 2015 (mostly self-reported pooling, HR 1.24 (1.09–1.41), notably smaller than the device-measured quarter-4 figure) / Diaz 2017 (REGARDS cohort; total-time quartile 4 HR 2.63 (1.60–4.30) matches Ekelund's despite a different cohort, but longer sedentary bout length was ALSO independently predictive (HR 1.96, 1.31–2.93 for the longest-bout group) — the honest reading is to break up sitting, not just reduce the total).

How to improve it

  • Spend more of your day moving: stand, walk or pace for a few minutes every hour
  • Take walking meetings or phone calls
  • Swap some sitting screen time for standing or moving
  • Break up long sitting stretches, not just the total — bout length predicted risk on its own

Sources

6 cited
  1. Patterson R, McNamara E, Tainio M, de Sá TH, Smith AD, Sharp SJ, Edwards P, Woodcock J, Brage S, Wijndaele K. (2018) — European Journal of Epidemiology
    Sedentary behaviour and risk of all-cause, cardiovascular and cancer mortality, and incident type 2 diabetes: a systematic review and dose response meta-analysis
    View source
  2. Ekelund U, Tarp J, Steene-Johannessen J, Hansen BH, Jefferis B, Fagerland MW, Whincup P, Diaz KM, Hooker SP, Chernofsky A, Larson MG, Spartano N, Vasan RS, Dohrn IM, Hagströmer M, Edwardson C, Yates T, Shiroma E, Anderssen SA, Lee IM. (2019) — BMJ
    Dose-response associations between accelerometry measured physical activity and sedentary time and all cause mortality: systematic review and harmonised meta-analysis
    View source
  3. Biswas A, Oh PI, Faulkner GE, Bajaj RR, Silver MA, Mitchell MS, Alter DA. (2015) — Annals of Internal Medicine
    Sedentary time and its association with risk for disease incidence, mortality, and hospitalization in adults: a systematic review and meta-analysis
    View source
  4. Diaz KM, Howard VJ, Hutto B, Colabianchi N, Vena JE, Safford MM, Blair SN, Hooker SP. (2017) — Annals of Internal Medicine
    Patterns of Sedentary Behavior and Mortality in U.S. Middle-Aged and Older Adults: A National Cohort Study
    View source
  5. Ekelund U, Steene-Johannessen J, Brown WJ, Fagerland MW, Owen N, Powell KE, Bauman A, Lee IM. (2016) — The Lancet
    Does physical activity attenuate, or even eliminate, the detrimental association of sitting time with mortality? A harmonised meta-analysis of data from more than 1 million men and women
    View source
  6. Stamatakis E, Gale J, Bauman A, Ekelund U, Hamer M, Ding D. (2019) — Journal of the American College of Cardiology
    Sitting Time, Physical Activity, and Risk of Mortality in Adults
    View source

Not part of your score
Sedentary Time is tracked here for its research. It does not count toward the 8-marker MarkerScore. See what does in the calculator.
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Educational content only — not medical advice, diagnosis, or treatment. Not a medical device; not FDA evaluated. Consult a qualified healthcare professional about your own health, and call emergency services for urgent symptoms. Full medical disclaimer →