Acceso usuarios
Francisco Javier Llorca Díaz, Dolores Prieto Salceda, Trinidad Dierssen Sotos, Miguel Delgado Rodríguez
Fundamento: Analizar el efecto que tiene la elección de una población de referencia sobre diferentes indicadores derivados de las tasas de mortalidad ajustadas por edad.
Métodos: Las tasas de mortalidad por diferentes causas de muerte en España de 1971 a 1992 son ajustadas empleando cuatro poblaciones de referencia: poblaciones españolas de 1971 y 1992, población estándar europea y población estándar mundial. Los resultados obtenidos con las cuatro poblaciones se comparan empleando tres indicadores:
diferencia entre las tasas de 1992 y 197 1, razón entre las tasas de 1992 y 1971~ cambio anual porcentual entre 1971 y 1992.
Comparison betwen Severa1 Standard Populations for Age-adjusting Background: To analyse the effect the choice of referente population has on different indicators derived from mortality rates age-adjusteing.
Resultados: En la mayor parte de las causas de muerte estudiadas incluyendo el total de causas, la cardiopatía isquémica y casi todos los tumores, la razón de tasas y el porcentaje de cambio anual son similares con independencia de cuál sea la población estándar empleada. En cambio, la diferencia de tasas es muy diferente en función de la población de referencia. En las enfermedades infecciosas y el cáncer de testículo se produce la situación contraria: la diferencia de tasas es robusta mientras que la razón de tasas varía con la población est5ndar. Finalmente, la mortalidad por neumonía, enfermedad de Parkinson y cáncer de encéfalo muestra cambios en los tres indicadores utilizados.
Methods: The mortality rates for different causes of dedth in Spain from 197 1 to 1992 were adjusted by using four referente populations: Spanish populations from 197 1 and 1992, the Standard European population and the standard world population. The results obtained with the four populations were compared by applying three indicators: difference between the rates of 1992 and 1971, ratio between the rates of 1992 and 197 1 and annual percentage change between 197 1 and 1992.
Conclusiones: Es necesario realizar un análisis de las tasas específicas por edad antes de proceder a su ajuste.
Este análisis permite averiguar si el ajuste por edades es correcto y qué indicador (diferencia, razón o cambio porcentual) será adecuado para realizar comparaciones.
Background: To analyse the effect the choice of referente population has on different indicators derived from mortality rates age-adjusteing.
Methods: The mortality rates for different causes of dedth in Spain from 197 1 to 1992 were adjusted by using four referente populations: Spanish populations from 197 1 and 1992, the Standard European population and the standard world population. The results obtained with the four populations were compared by applying three indicators: difference between the rates of 1992 and 1971, ratio between the rates of 1992 and 197 1 and annual percentage change between 197 1 and 1992.
Results: In the majority of the causes of death studied, including the total, ischemic heart disease and almost al1 of the tumours, the ratio between the rates and the percentage of annual change are similar regardless of the standard population used. However, the difference in rates is very noticeable in relation to the referente population. In the infectious diseases and testis cancer, the opposite occurs: the different in rates is steadfast while the ratio between the rates varies with the standard population.
Finally, the mortality due to pneumonia, Parkinson�s disease and encephalic cuncer show changes al1 three indicators used.
Conclusions: An analysis of the specific rates by age must be made before proceeding with their adjustment. This analysis will enable us to ascertain whether the adjustment by age is correct and which indicator (difference, ratio or percentage change) will be appropriate for making comparisons.
