冷水浸漬負荷試験による振動障害スクリーニング・レベルに関する検討

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書誌事項

タイトル別名
  • A STUDY RELATING TO THE SCREENING LEVEL OF VIBRATORY HEALTH HAZARDS BY COLD WATER IMMERSION LOAD TESTS
  • レイスイ シンセキ フカ シケン ニヨル シンドウ ショウガイ スクリーニング
  • RESEARCH THROUGH MATCHED PAIRS
  • matched-pairsによる研究

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説明

A Study was conducted on changes in finger temperature in cold load tests of the fingers (immersion of the fingers in 5°C water for 10 minutes) in order to establish a screening level to be used for the early diagnosis of vibratory health hazards.<BR>The materials used for the study were health examination reports of 1, 979 on forestry workers who used vibratory tools (chain saws and bush cleaners). Raynaud's syndrome had been noted in all of the subjects of the study and they were all certified as individuals suffering from vibratory health hazards as well. Thirty-four matched pairs were made up. The pairs were composed by teaming up non-afflicted individuals with the same finger-tip temperature under normal conditions as afflicted individuals with a like number of afflicted individuals of the same age.<BR>The main points of the results obtained are as follows : <BR>1) The findings obtained in studies not using matched pairs, in which it was claimed that there were differences in finger-tip temperatures between afflicted and non-afflicted individuals both during and at the termination of the cold load, were not observed in the studies covered by this report.<BR>2) In a comparison of average values, the finger-tip temperatures at five and 10 minutes after terminating the cold load were higher in the non-afflicted than in the afflicted group (P <0.01).<BR>3) As indices showing the state of restoration of finger-tip temperature after termination of the cold load, the following three items were used : a) degree of recovery (finger-tip temperature five or 10 minutes after termination of the load) - (finger-tip temperature at the termination of the load) : b) recovery rate (finger-tip temperature five or 10 minutes after termination of the load×100/finger-tip temperature under normal conditions), and c) m.r.c. (mean rates of change as given by Askovitz).<BR>In each of these three indices, the cut-off point at which the vibratory health hazards could be detected most effectively was obtained by McNemar's test, while the sensitivity adjudged at the time of the cut-off point (ratio of true sufferers included in those findings were positive in the tests) and specificity (ratio of true non-sufferers included in those whose findings were negative in the tests) were sought. The cut-off points, sensitivity percentages and specificity percentages are shown in the table below. The cut-off points shown in the table comprise the screening level of each of the recovery indices.

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