製紙工場の最近5ヵ年間に於ける肺結核症の動態

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  • Epidemiological Studies of Lung Tuberculosis in a Paper Manufacturing Mill during Recent Five Years
  • セイシ コウジョウ ノ サイキン 5 ネンカン ニ オケル ハイケッカクショウ ノ ドウタイ

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According to the result of totally 10 time mass-screening examinations of pulmonary tuberculosis carried out annualy twice spring and fall during five years, the following conclusions were obtained.<br>1) Both the roentogenographically positive finding rate and prevalence rate of actual case had been decreased over a period of five years.<br>2) Cases of mixed form with exsudative and fibroid lesions, according the Oka roentonographic classification, was most apparently decreased in five years. In the forms of the hardnodular and calcified-scar lesions the rates did not any significant changes, and the form with the deformation by surgical operations increased by the spring 1957 and no change was observed after that. Occurrence of exsudative pleurisy was very seldom.<br>3) In the classification of guide standard, number of the patients with the A calss (off work required) and the class B (limitted working hour) remarkably decreased, and those of the class C (under supervision) relatively increased.<br>4) According to the classification by the Japan Society of Tuberculosis, no case with extensively advanced cavity form was found through the observation, and cases with not-advanced cavity form disappeard by the end of the observation. Also cases with the varied non-cavity form was obviously decreased. No apparent changes were shown in the unmber of cases with the stable non-cavity form and the recovered form.<br>5) The decrease of the number of cases with exsudative form seemed to be more apparent in the group of workers with medium physical work, compared with that group of desk workers. The increase of both the roentogenographically positive finding rate and prevalence of actual case was observed by the older years of age, and the trend was not so much varied through the five year observation.

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