Descriptive Epidemiology

Table 2-3 gives results of age-standardized incidence rates from the same countries shown in Table 2-1. With male rates varying between 1 and 4 per million per year and females stable at about 1, this very rare condition gives few clues as to its possible etiology. It increases in incidence with age as is shown in Table 2-4, so that by the age group 75 to 79 male U.K. incidence is 1.5 per 100,000 per year and female incidence is 0.6.77 There is no evidence that the condition has changed in incidence between 1984 and 1993.7

Little else is known of its descriptive epidemiology.

Table 2-3. Age-Standardized World Incidence Rates of Hairy Cell Leukemiaa

Male Female

Zimbabwe, Africa


Cali, Colombia


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