Abstract
Abstract In previous reports it was pointed out that the average yearly percentages of male donors in The Netherlands (Leiden) with a blood sedimentation rate (BSR) 1–2 mm/1st hr showed a clearly fluctuating pattern which could not be explained with any of the usual meteorological parameters although they can explain the daily and seasonal fluctuations in BSR patterns. The average BSR percentages 1–2 mm/1st hr increased from 1955 (29.9%) till 1958 (54.7%, highest observed average yearly percentage), decreased till 1960 (30.7%), increased again till 1963 (39.3%), followed by a decrease till 1966 (22.9%, lowest observed average yearly percentage), new increase till 1968 (28.2%) and again a decrease till 1971 (<26%) and during 1972. These figures were based on approximately 11,000 male donors in Leiden per year. In order to study the possible mechanism of these fluctuations four types of research are at present in progress. Similar BSR patterns are studied in the blood bank data received from other parts of ...
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