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A health knowledge questionnaire was administered to 139 hearing and 66 hearing-impaired high school students from 12 to 18 years of age. The level of health knowledge of the normally-hearing students was found to be superior to that of hearing-impaired students at all ages but appeared not to improve with increasing school grade. In contrast, the health knowledge of the hearing-impaired students increased markedly from Grade 8 to Grade 12, so that by Grade 12 they were achieving only marginally below their hearing grade mates. Some of this apparent increase in health knowledge probably was due to the fact that only academically able hearing-impaired students continue at school in Australia after Grade 10. Deficits in the health knowledge of hearing-impaired students were distributed uniformly over all areas investigated.