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3083677 
Journal Article 
Risk of asbestosis in crocidolite and amosite mines in South Africa: an erratum 
Irwig, LM; du Toit, RS; Sluis-Cremer, GK; Thomas, RG 
1984 
Yes 
American Journal of Industrial Medicine
ISSN: 0271-3586
EISSN: 1097-0274 
NIOSH/00192660 
5 
6 
479-483 
English 
6328979 
The results of an earlier study of men employed in crocidolite (12001295) and amosite (12172735) asbestos mines and mills in South Africa were presented in 1979. The results of this earlier paper indicated that the prevalence of pleural abnormality was related to both age and duration of asbestos exposure. Pleural abnormality was more common in men of mixed race than in white men. Men working with amosite tended to develop a higher prevalence of pleural abnormality than those working with crocidolite. However, pleural abnormality was not related to the average fiber concentration during their working life in the mines. Parenchymal abnormality was not related to rate or asbestos type but was predicted by age and the duration of asbestos exposure. As additional study was being made of these data, the authors uncovered an error in the program which was used to generate a summary file on which analyses for this paper were performed. A reanalysis was made of the data. The reanalysis indicated that duration of asbestos exposure, age, and the average short fiber concentration were all independently highly significantly associated with the prevalence of parenchymal abnormality. A similar result was obtained when the duration of asbestos exposure and short fiber concentration were used as continuous variables in a logistic regression predicting parenchymal abnormality. Also included in this present paper were the results from an analysis of the relationship between parenchymal abnormality and average long fiber concentration. 
Asbestos, Crocidolite; 12001-28-4; Asbestos, Amosite; 12172-73-5; Asbestos; 1332-21-4; Index Medicus; Disease Susceptibility; South Africa; Asbestosis -- epidemiology 
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