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Revista Española de Salud Pública

On-line version ISSN 2173-9110Print version ISSN 1135-5727


LLORCA DIAZ, Javier; PRIETO SALCEDO, M. Dolores  and  DELGADO-RODRIGUEZ, Miguel. The analysis of the cohort effect on the trend in the mortality due to motor neuron disease in Spain 1951-1992. Rev. Esp. Salud Publica [online]. 1999, vol.73, n.4, pp.477-484. ISSN 2173-9110.

BACKGROUND: An increase in the mortality due to motor neuron disease (MND) has been reported in Spain over the past 30-40 years. It has been suggested that this increase is due to the cohort effect, but his hypothesis has not been proven. METHODS: The motor neuron disease (MND) mortality statistics by age and by gender were furnished from the Spanish National Institute of Statistics. The mortality specifically by age and the adjusted age-related rates were calculated. By Poisson regression, the cohort effect of birth on the mortality by ages has been analyzed, the cohort effect also having been analyzed by graphic methods. RESULTS: The mortality adjusted by age was declining up until 1969, as of which time it has been on the rise. Each five-year birth cohort increases the risk of dying from MND by 8.5%.) CONCLUSIONS: The increase in the mortality due to MND in Spain is the result of a cohort effect.

Keywords : Motor neuron disease; Mortality; Cohort effect.

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