1011 e-Letters

  • Conclusion on the impact of interventions is not supported by data in the paper
    Amy Tuteur, MD

    Dahlen et al. claim:

    "The continual rise in obstetric intervention for low-risk women in Australia is concerning in terms of morbidity for women and cost to the public purse. The fact that these procedures which were initially life- saving are now so commonplace and do not appear to be associated with improved perinatal death rates demands close review."

    However, the authors never looked at the perinata...

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  • Life expectancy record holders not most equal if compared within life expectancy levels
    Jeroen Smits

    Christiaan Monden, lecturer (1), Jeroen Smits, associate professor (2)

    1. University of Oxford, 2. Radboud University Nijmegen

    Vaupel, Zhang and Van Raalte (VZ&V) have made an interesting contribution to the study of variation in length of life (or life disparity as they call it) on the basis of life table data [1]. A fascinating aspect of this literature is that the inequality measures that are...

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  • Letter in response to Bhattachariya et al. August 2012
    Patrick Carroll

    Dear Sirs

    Re:Reproductive outcomes following abortion: A national register- based cohort study in Scotland. Bhattacharya S et al. BMJOpen August 2012

    The authors of this study do not acknowledge that some hundreds of Scottish resident women come to England each year for abortions. As a consequence they are underestimating the risk of premature births post abortion.

    The numbers are significa...

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  • Corrigendum
    Mark Taylor

    It is worth noting that 'RR' in the title of our article is indeed 'relative risk' but that there is no statistical inference associated with our use of this term.

    Also, I am grateful to Ross Bearman and others for pointing out some typos / errors in our paper - namely: The introduction states cannabis is a class C drug, the correct designation of class B is listed in table 1.

    Figure 2 identifies methyl...

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  • Response to: "No doubt that dehydration impairs exercise performances and risks health."
    Braden G. O'Neill

    We agree with Dr Stachenfeld that the medical community should consider exercise a priority for research and practice; however we feel it is important to address a concern raised in her response, which questioned the relative importance of systematic reviews compared to an individual randomized trial.

    Systematic reviews of randomized controlled trials are now widely considered to be the highest quality evidence...

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  • Response to comments to "Criminality in men with Klinefelter's syndrome and XYY syndrome: a cohort study"
    Claus H. Gravholt

    We thank Steve Hammett, Jim Moore and Gary Glissman for their interest in our paper and for their comments. They all express the opinion, to a varying degree, that the content should be detrimental for patients with KS and 47,XYY syndrome. We understand this point, but we disagree, and we can iterate that as physicians caring for hundreds of patients with sex chromosome disorders through many years, being involved in res...

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  • Response to Fitzpatrick, JP; Elliott, EJ and Latimer, J et al.
    Judith S Gould

    Response to Fitzpatrick, JP; Elliott, EJ and Latimer, J et al. The Lililwan Project: study protocol for a population-based active case ascertainment study of the prevalence of fetal alcohol spectrum disorders (FASD) in remote Australian Aboriginal communities. Fitzpatrick, JP; Elliot, EJ and Latimer, J et al state that, 'standardised and locally developed clinical assessments whose interpretation is less biased by culture...

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  • No doubt that dehydration impairs exercise performances and risks health.
    Nina Stachenfeld

    I was pleased to see that physicians were at last taking an interest in physical activity as a method of preventive medicine. Further, I could not agree more that there are many claims made by manufacturers regarding improving performance that are unsupported by the literature (if there is any literature at all). In this note, I will not address anything other than claims made regarding fluid regulation, and do not supp...

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  • Non-normally distributed data
    Rajvir Singh

    To the Editor

    Title : Non-Normally Distributed Data

    Student t test (independent) compares the mean of an outcome variable for different subjects and widely but incorrectly believed that it is valid only for normally distributed outcomes even in very small samples; ignoring the fact that it is also valid for any distribution in large samples (1).

    Normality assumpt...

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  • Searching for open source software
    Elizabeth A Dodd

    The method chosen by Millard, Bru and Berger to search for open source electronic medical record systems has missed a number of packages. Instead of searching Google Scholar, a search through a generic search engine would have brought up the Wikipedia list http://en.wikipedia.org/wiki/List_of_open-source_healthcare_software This list contains a number of packages (the open source term) not seen on either on the included or...

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