eLetters

74 e-Letters

published between 2000 and 2003

  • Occupational exposure of midwives to nitrous oxide on delivery suites
    Sergio Ghittori

    Dear Editor

    In our opinion, the article by Henderson et al.[1] Occupational exposure of midwives to nitrous oxide on delivery suites is in need of some remarks.

    In the paper a serious problem seems to be the presence of nitrous oxide in samples collected at the beginning of the shift. Many years ago, during the first studies about the evaluation of N2O in urine , we have frequently observ...

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  • Authors' Reply
    Lützen Portengen

    Dear Editor

    We would like to thank Dr Preece for his letter.[1]

    He raises the issue that loss of symptomatic workers during follow-up does not explain the absence of a decline in lung function in workers who worked with laboratory animals for more than 4 years, and concludes that lung function decline in short-term employed workers is not sustained. We think that this interpretation of our data is somewhat ove...

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  • Lung function decline in laboratory animal workers
    Richard M Preece

    Dear Editor

    In their recent paper Portengen et al.[1] 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...

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  • Asthma and swimming pools: statistical issues
    Alfred M. Bernard

    Dear Editor

    Although we appreciate the interest of Dr Armtrong and Dr Strachan for our paper on the pool chlorine/asthma risk,[1] we cannot really take on board their reasoning concerning the statistical analyses. When questioning the strength of the associations found in our studies, they seem indeed to attribute much importance to the p values of the associations emerging between cumulated pool attendance and ind...

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  • Comments on article by Koh and Aw
    Chris Kalman

    Dear Editor

    Quoting both dictionary definitions and statuory requirements, Koh and Aw's education article [1] limits the definition of occupational "health surveillance" to the detection of adverse health effects resulting from occupational exposures. In doing so, they exclude international and national requirements for occupational health and medical surveillance to assess fitness for work.

    Looking at th...

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  • Asthma and swimming pools: statistical issues
    Ben G Armstrong

    Dear Editor

    Bernard et al.[1] presented results from several studies investigating childhood asthma in relation to swimming pool use. Though the studies were generally well-conducted, there are some respects in which the statistical analysis and interpretation are misleading.

    The study of asthma prevalence in relation to swimming pool use was essentially an ecologic design - the unit of analysis was...

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  • Inhaling volcanic ash on Montserrat
    J. Gordon Avery

    Dear Editor

    I have only recently had an opportunity to see the OEM online abstract of this paper[1] but I did see the unpublished original version in the Health Department archives whilst I was Chief Medical Officer on Montserrat from late 1998 to late 2000.

    My first comment is that this survey of schoolchildren was carried out in February 1998 and yet it has only now been published in a scientific journ...

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  • The Occupational Hygiene Hypothesis
    John H. Lange

    Dear Editor

    The hygiene hypothesis has grown into a popular idea for explaining the increase in asthma and atopy in children,[1,2] although it remains controversial.[3]

    This hypothesis can be extended to adults, especially those in certain occupations. It is suggested that there is another form of the hygiene hypothesis – called the occupational hygiene hypothesis.[4] In 1965, it was observed that those expos...

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  • Asthma in young children
    David C Coward

    Dear Editor

    Having suffered from Asthma all my life I am surprised that common hasards in the daily life of children are not addressed even in the 21st century. Chlorine in swimming baths was always a problem to me as a child, it was used far more concentrated than nowadays.

    Another very serious trigger was to be found in cardboard containers of fruit drinks though. I now realise that they contained Sodium...

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  • Publication by Kraus et al., December 2002
    David Bernstein

    Dear Editor

    The paper by Kraus and colleagues[1] in the December 2002 issue of Occupational and Environmental Medicine addresses the important issue of the relationship of personal exposure to possible effect in an industrial setting. After reading this paper I would like to make some comments with regard to the design, conduct and statistical analysis of the study.

    In an area where exposure assessment...

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