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Modelling physical activity: a multi-state life-table approach.

M I Tobias1, M G Roberts

  • 1Ministry of Health, Wellington, New Zealand. martin_tobias@moh.govt.nz

Australian and New Zealand Journal of Public Health
|May 19, 2001
PubMed
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Physical inactivity causes 2,600 annual deaths in New Zealand. Promoting activity maintenance is 50% more effective than increasing uptake, with combined strategies reducing inactivity prevalence by 30%.

Area of Science:

  • Public Health
  • Epidemiology
  • Health Promotion

Background:

  • Physical inactivity represents a significant public health burden in New Zealand.
  • Understanding the epidemiological trends and demographic impacts on physical activity is crucial for effective health interventions.

Purpose of the Study:

  • To establish epidemiological estimates for physical activity (incidence, prevalence, remission, mortality) in New Zealand.
  • To project these estimates considering demographic shifts and predict the efficacy of various health promotion strategies.

Main Methods:

  • Construction of multi-state life tables using 1996/97 New Zealand Health Survey data on physical inactivity.
  • Incorporation of literature-based estimates for mortality risk and remission rates.
  • Forecasting using Statistics New Zealand population projections and simulation of health promotion strategies (uptake enhancement and relapse reduction).

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Main Results:

  • Physical inactivity is linked to 2,600 deaths annually in New Zealand, accounting for 9% of all deaths.
  • Demographic trends are projected to increase physical inactivity prevalence by 4% by 2021.
  • Relapse reduction strategies are approximately 50% more effective than uptake enhancement, with combined approaches potentially reducing inactivity prevalence by 30%.

Conclusions:

  • Multi-state life table modeling effectively assesses health risks, including behavioral factors.
  • The study provides valuable data for policymakers regarding the burden of physical inactivity, demographic influences, and optimal health promotion strategies in New Zealand.