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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.

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