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The Intradermal Tuberculin Test as a Research Tool
Abstract
Epidemiological studies and controlled comparative trials in tuberculosis require precise measurement of delayed hypersensitivity to tuberculin, and only the intradermal test can provide this accuracy. The correct procedures for random sampling, random allocation of treatments and blindness of assessment are discussed. Some basic principles of planning, collecting and recording data, analysing and interpreting of results, are illustrated by two examples.
S. Afr. Med. J., 47, 142 (1973)
S. Afr. Med. J., 47, 142 (1973)