Eighty patients with aplastic anaemia have been found among 1.2 mill. inhabitants in Sweden during the 5‐year period 1964–68, corresponding to an incidence of 13/1 mill. and year. Only 13 patients (16%) were alive 3–7 years after the initial symptoms, most patients dying after a comparatively short time (<2 y.). The aetiology in most patients remains unknown, more often so among older (81 %) than younger (38%) patients.
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Böttiger et al. (1972) studied this question.