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Annals of Oncology 15:686-688, 2004
© 2004 European Society for Medical Oncology

Original Paper

Age–period–cohort analysis of breast cancer mortality rates in Andalucia (Spain)

Received 13 May 2003; revised 31 October 2003; accepted 2 January 2004

Background:

The aim of this paper is to analyse breast cancer mortality in Andalucia (Spain) between 1975 and 1999 based on age–period–cohort.

Patients and methods:

Mortality data were obtained from the Mortality Registry of Andalucia. Deaths and population were divided into 13 age groups and five 5-year periods. From this, age-specific mortality rates for 17 birth cohorts were computed. These were plotted and fitted to Poisson regression models to assess age, period and cohort effects.

Results:

The best fit was found for the complete model, which simultaneously considered the effects of age–period–cohort. Cohort effects were found to be more important than period effects in terms of model fit.

Conclusion:

These effects were manifest as a seemingly consistent increase in the relative risk of breast cancer mortality with a three-fold increase in women born in the 1950s relative to those born in the 1890s.

A. Cayuela1,*, S. Rodríguez-Domínguez2, M. Ruiz-Borrego3 and M. Gili4

1 Supportive Research Unit and 3 Oncology Department, Virgen del Rocío Hospital, Seville; 2 Benacazón Health Center, Seville; 4 Department of Social Sciences, University of Seville, Andalucia, Spain

Key words: Andalucia, breast cancer, epidemiology, mortality


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