A comparison of the relative sensitivity of two types of Heaf gun.
A total of 696 secondary school children were given a Heaf test in one forearm with a magnetic head Heaf gun and in the other forearm with a fixed head gun. One week later the results were read blind. In 333 (48%) children the fixed head gun gave a more strongly positive result than the magnetic head gun, while in only 27 (4%) children did the magnetic head gun gives a more strongly positive result. These findings are statistically highly significant (p less than 0.001).
Walker
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D
Department of Community Medicine, Fife Health Board, Glenrothes, Scotland.
Davie
A
A
D000293:Adolescent; D005188:False Negative Reactions; D005542:Forearm; D006801:Humans; D006968:Hypersensitivity, Delayed / Q000473:pathology; D016037:Single-Blind Method; D014374:Tuberculin Test / Q000295:instrumentation*