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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 1

Characteristics and main results of the prospective cohort studies included in the meta-analysis

Study Participants Age at baseline (years) Follow-up (years) Person-years Deaths (n) Results
Sitting time
 Katzmarzyk et al15 (Canada Fitness Survey) N=17 013 men and women 18–90 12 204 732 1832 None/¼ time ½ Time ¾ Time/all
Deaths 826 542 464
Person-years 117 965 52 346 34 421
Crude RR* 1.00 1.48 1.93
Age-sex-HR 1.00 1.14 1.51
 Patel et al16 (Cancer Prevention Study II Nutrition Cohort) N=123 216 men and women 50–74 14 1 610 728 19 230 <3 h 3–5 h ≥6 h
Deaths 7068 9194 2968
Person-years 755 214 688 709 166 805
Crude RR* 1.00 1.43 1.90
Age-sex-HR 1.00 1.18 1.44
TV viewing
 Dunstan et al17 (Australian Diabetes, Obesity and Lifestyle Study (AusDiab)) N=8800 men and women ≥25 6.6 58 087 284 <2 h 2–3.9 ≥4 h
Deaths 105 125 54
Person-years 33 024 20 737 4326
Crude RR* 1.00 1.89 3.93
Age-sex-HR 1.00 1.20 1.67
 Stamatakis et al18 (Scottish Health Survey) N=4512 men and women ≥35 4.3 19 364 325 <2 h 2–3.9 h ≥4 h
Deaths 42 138 146
Person-years 3328 10 548 5488
Crude RR* 1.00 1.04 2.11
Age-sex-HR 1.00 1.13 1.77
 Wijndaele et al19 (EPIC—Norfolk Study) N=13 197 men and women 45–79 9.5 124 902 1270 <2.5 h 2.5–3.6 h >3.6 h
Deaths 291 414 565
Person-years 41 936 42 288 40 680
Crude RR* 1.00 1.41 2.17
Age-sex-HR 1.00 1.17 1.32
  • * RR ratio.

  • Age- and sex-adjusted HR.

  • TV, television.

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