It has proved possible to demonstrate that the figures for DHF notifications, which are unevenly distributed throughout the country, are independent of physician density. This is to challenge the argument that improved medical services would result in higher numbers of notifications, whereas poor medical services would leave doctors little time or interest for filling in the detailed notification papers. Notification is not carried out by the doctor himself in Thailand, but as a rule by a health worker at the basic level, or, as the case may be, by a health official at the local health service office who visits hospitals at regular intervals. Although a largish number, or even the majority, of the less serious cases that only attend the outpatients department, are slipping through the statistical net, it can be assumed that the disease dynamic is nonetheless represented by the cases that are admitted to hospital. These presuppositions alone justify further statements. On the other hand any sophisticated statistical procedures were avoided.
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