Journal Article

Statistical modelling needed to find the effects from a community-based elderly safety promotion program

Pia M. Johansson, Antonio Ponce de Leon, Siv Sadigh, Per E. Tillgren and Clas Rehnberg

in The European Journal of Public Health

Published on behalf of European Journal of Public Health

Volume 19, issue 1, pages 100-105
Published in print January 2009 | ISSN: 1101-1262
Published online November 2008 | e-ISSN: 1464-360X | DOI: https://dx.doi.org/10.1093/eurpub/ckn102
Statistical modelling needed to find the effects from a community-based elderly safety promotion program

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  • Public Health and Epidemiology
  • Economics of Health
  • Health, Illness, and Medicine

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Background: Multiple control areas and time-series analyses have been recommended for effect evaluations of community-based health promotion. Large fluctuations, maybe due to chance, among the areas and over the years might obscure the intervention effect. Methods: A quasi-experimental time-series analysis with several control areas was performed as an effect evaluation of a community-based elderly safety promotion program. The program was implemented during 1995–99 in a community in the Stockholm Metropolitan area (population +65 years: 5500; number of first hip fractures in 1995: 60). Four control areas were selected based on similar hip fracture-related characteristics as the intervention community, complemented with two larger control areas. The time series covered 6 years pre-intervention (1990–95) and 6 years post-intervention (1996–2001). The study population was divided into two age groups and gender, resulting in 28 panels. The first hip fracture incidence was obtained from the Swedish national in-patient register. Results: The time series revealed no discernible pattern, and conventional analyses showed no conclusive results. A multivariate analysis, examining the time trends by employing the intra-annual and intra-panel variance, revealed the underlying trends in hip fracture rates. Comparisons between predicted numbers of hip fractures in the intervention and control areas was enabled, which resulted in 14 less hip fractures in the intervention community than expected from the control communities. If one extreme value was altered, the result changed considerably. Conclusion: Effect evaluations of community-based health promotion programs using time-series from small communities might give faulty results, if statistical modelling is not employed.

Keywords: community intervention; effect evaluation; elderly injuries; panel data; random effects

Journal Article.  3960 words.  Illustrated.

Subjects: Public Health and Epidemiology ; Economics of Health ; Health, Illness, and Medicine

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