Menu

rss
BMJ Open 2: doi:10.1136/bmjopen-2012-000828
  • Public health
    • Research

Sedentary behaviour and life expectancy in the USA: a cause-deleted life table analysis

Table 2

Prevalences of sitting and TV viewing at baseline in the prospective cohort studies included in the meta-analysis

Study Prevalences
Sitting time
 Katzmarzyk et al15 (Canada Fitness Survey) None/¼ time ½ Time ¾ Time/all
Source prevalence (%)* 56.9 25.7 17.4
Case prevalence (%)† 45.1 29.6 25.3
Case:source ratio 0.79 1.15 1.45
 Patel et al16 (Cancer Prevention Study II Nutrition Cohort) <3 h 3–5 h ≥6 h
Source prevalence (%)* 46.2 43.1 10.7
Case prevalence (%)† 36.8 47.8 15.4
Case:source ratio 0.80 1.11 1.44
Average case:source ratio‡ 0.80 1.11 1.44
TV viewing
 Dunstan et al17 (Australian Diabetes, Obesity and Lifestyle Study (AusDiab)) <2 h 2–3.9 h ≥4 h
Source prevalence (%)* 56.5 35.9 7.6
Case prevalence (%)† 37.0 44.0 19.0
Case:source ratio 0.65 1.23 2.50
 Stamatakis et al18 (Scottish Health Survey) <2 h 2–3.9 h ≥4 h
Source prevalence (%)* 17.1 54.1 28.8
Case prevalence (%)† 13.4 45.2 41.4
Case:source ratio 0.78 0.84 1.44
 Wijndaele et al19 (EPIC—Norfolk Study) <2.5 h 2.5–3.6 h >3.6 h
Source prevalence (%)* 33.3 33.8 32.9
Case prevalence (%)† 22.9 32.6 44.5
Case:source ratio 0.69 0.96 1.35
Average case:source ratio‡ 0.69 1.03 1.75

  • ↵* Prevalences of sitting or TV viewing in the source population at baseline.

  • ↵† Prevalences of sitting or TV viewing in cases (decedents) at baseline.

  • ↵‡ Weighted average case:source prevalence ratio from the prospective cohort studies.

  • TV, television.

This Article

  1. Abstract
  2. Full text
  3. PDF
  4. Previous versions
  5. Review history
  6. Press release
  7. Press release

Don't forget to sign up for content alerts to receive selected information relevant to your specialty interests and be the first to know when the latest research is published.