In their recent paper Portengen and colleagues have made an important contribution to our understanding of laboratory animal allergy. However, they have omitted to draw attention to an observation of clinical importance to occupational physicians. They have suggested that the lack of decline in lung function in ‘‘experienced’’ workers may be due to the healthy worker effect. Their suggestion is...

this paper aim to study effect of women's employment on family stability, compare dual-worker family with single-worker family. statistical population of quantitative cross-sectional survey was married in tehran. selected 1736 samples and was analyzed. multi-stage cluster sampling method was used and due to the different economic and social classes of people, selected 50 domains in tehran....

The strong logicodeductive method of science is applied in an investigation of the mortality of a large population of communications workers (338 306 white men) to explain the mortality deficits so often observed in occupational studies. A theory for the healthy worker effect is proposed, and its predictions are tested in comparisons of mortality curves fitted to Weibull functions using regress...

Recently in Japan dioxin problem of municipal solid waste incinerator (MSWI) became social issue. The news spread all around Japan and induced fear that workers at incinerators would suffer from cancer or other serious illness induced by the exposure to dioxins. Authors were interested in the effect of this stressful event occurred to the workers and intended to evaluate mental health status of...

Queen pheromones are essential for regulation of the reproductive division of labor in eusocial insect species. Although only the queen is able to lay fertilized eggs and produce females, in some cases workers may develop their ovaries and lay male-destined eggs, thus reducing the overall colony efficiency. As long as the queen is healthy, it is usually in the workers' collective interest to wo...