Translating evidence about occupational conditions into strategies for prevention

Our plain-English summary of Translating evidence about occupational conditions into strategies for prevention, by D.K. Verma, J.T. Purdham, H.A. Roels (Occupational and Environmental Medicine, 2002).

The study

• Authors: D.K. Verma, J.T. Purdham, H.A. Roels
• Journal: Occupational and Environmental Medicine
• Published: 2002;59(3):205-13; quiz 214
• Type of article: Review
• Cited by: 29 articles, as counted by NIH iCite
• Read it: PubMed · Publisher · Free full text

Summary of the article

This educational review examined how evidence about hazardous workplace conditions has been translated into prevention strategies. The authors described control at two levels. At the societal level, control is mainly by regulation, ranging from guidelines to exposure limits to bans. At the workplace level, it includes substitution, engineering controls, personal protective equipment, education and training, and surveillance. They presented the process as three linked boxes: sources of evidence (toxicology, epidemiology, occupational medicine, occupational hygiene, unions and workers), scientific, social and economic influencing factors, and prevention strategies. Eight case studies illustrated the process: vinyl chloride, 2-naphthylamine, asbestos, silica, benzene, flour dust, noise and manganese. For asbestos, the authors described asbestosis reported in 1907 and lung cancer in the 1930s, slower acceptance by industry, and debate over the extent of risk and over fibre types, which delayed stricter control. North American standards now stood at 0.1 fibres/ml for all types, compared with an early-1970 ACGIH limit of 5 million particles per cubic foot (very roughly 30 fibres/ml). They noted the proposed European Union ban, Canadian lobbying against it, and predicted an epidemic of asbestos-related disease in developing countries where asbestos remains widely used. For vinyl chloride, first reports in 1974 were followed by controls in 1975. The authors concluded that there has usually been a very long delay between first evidence and effective control, and that little changes at workplaces without specific regulation.

PubMed has no abstract for this study, and the article doesn't print one. We wrote this summary from the full article with the help of AI. It is not the authors' wording.

In plain English

This is an educational review, not an original study. The authors described how evidence about workplace hazards is translated into prevention strategies, using eight case studies: vinyl chloride, 2-naphthylamine, asbestos, silica, benzene, flour dust, noise and manganese. In the asbestos section, they wrote that lung cancer in asbestos workers was reported in the 1930s and well established by the 1950s. They also wrote that debate over the extent of the risk, and over whether all asbestos types are equally harmful, caused significant delay in stricter controls. They reported that the North American exposure standard was then 0.1 fibres/ml for all types of asbestos, down from a recommended limit in early 1970 of 5 million particles per cubic foot, very roughly 30 fibres/ml. They noted that Canada, a leading chrysotile producer, lobbied against a proposed European Union ban while itself banning crocidolite imports. They predicted an epidemic of asbestos-related disease in developing countries. The authors concluded that, in most instances, a very long time passed between the first evidence linking an agent to a disease and a control strategy the affected parties could accept.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Educational review article using selected historical case studies; no original data collected
• Who was studied: No study population. Eight case studies of occupational hazards: vinyl chloride, 2-naphthylamine, asbestos, silica, benzene, flour dust, noise and manganese
• Exposure: Multiple workplace agents. The asbestos case study covers asbestos in general (chrysotile, amosite and crocidolite named as the most widely used) and its links to asbestosis, lung cancer and mesothelioma
• Main results:
  • The authors wrote that lung cancer in asbestos workers was reported in the 1930s and was well established by the 1950s
  • The authors described strong debate on the true extent of asbestos risk and on whether all types of asbestos are equally capable of causing disease
  • According to the authors, these arguments resulted in significant delay in introducing stricter control and prevention strategies for asbestos
  • Asbestos exposure standards came to be based on measuring fibres thinner than 3 µm in diameter and longer than 5 µm in length
  • The North American asbestos exposure standard was set at 0.1 fibres/ml for all types of asbestos. The ACGIH recommended limit in early 1970 was 5 million particles per cubic foot, which the authors described as very roughly equivalent to 30 fibres/ml
  • Canada, a leading producer of chrysotile asbestos, lobbied against the European Union's proposed total ban on asbestos
  • Canada itself chose to ban the import of crocidolite asbestos
  • The authors predicted that developing countries, where asbestos continues to be widely used, will see an epidemic of asbestos-related diseases for decades
• The authors' conclusion: The authors concluded that in most instances there has been a very long time between the first evidence linking an agent to a disease and a control strategy acceptable to the affected parties

Topics

Medical terms in this study, explained in our Lexicon: Engineering Controls, Epidemiology, Lung Cancer, Million Particles per Cubic Foot (mppcf).

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