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© 1987 Oxford University Press

research-article

The Age Curve of Nervous System Tumour Incidence in Adults: Common Shape but Changing Levels by Sex, Race and Geographical Location

JOHAN P VELEMA and ALEXANDER M WALKER*

International Agency for Research on Cancer. 150 cours Albert Thomas 69372 Lyon. cedex 08, France

A multiplicative model was fitted to incidence rates of nervous system tumours cross-tabulated for each sex by fiveyear age groups between ages 35–64 and 51 populations in which at least ten cases had been observed and 60% of cases histologically verified. There was no significant departure from a model in which the age curve was assumed to have the same shape but a different level in each population. On log-log scale this shape was a straight line with identical slope (2.6) for males and females. Population-specific multipliers were highest in Israel and lowest in Asia. Within the US, rates were significantly lower among blacks. Hispanics, Chinese and Japanese compared to whites. A model for both sexes combined showed that sex ratios were rarely below unity but varied significantly between populations. Exposure for susceptibility) to as yet unidentified aetiological factors appears to be higher in males and whites than in females and non-whites.

Revised 1 March 1986


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