Lungs taken at autopsy from 100 urban residents were studied to determine concentrations of 21 trace metals, dust, free silica and hydroxyproline. Medical, occupational and environmental histories were collected so that correlation studies might be done. The potential value of this data as a baseline for further studies of occupationally diseased lung tissue was assessed by evaluating the results of an analysis of variance. The personal histories were used as the criteria for classifying the observations (lung concentrations) into groups for the statistical analysis.
Air contaminant concentration measurements are an important part of the evaluation of a local exhaust system's effectiveness. Comparisons of concentration measurements have been used to assess the importance of work practices and emission sources in relation to the worker's exposure. These comparisons can be stated as a null hypothesis. Statistical tests can be used to evaluate the validity of the null hypothesis. Applicable tests include student t-test, analysis of variance and Duncan's Multiple Range Test.
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