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Archived Comments for: Clinical presentation and predictors of outcome in patients with severe acute exacerbation of chronic obstructive pulmonary disease requiring admission to intensive care unit

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  1. Statistical Error

    Surya Bhatt, St Luke

    10 January 2007

    This paper is, in general, well written. However I would like to point out some glaring discrepancies in Table 5. When the 95% confidence interval crosses one as for hypercapnia, it would not be significant. Also, to say hypercapnia and presence of co-morbidity significantly predicted death would be wrong as the odds ratio is less than one, suggesting exactly the opposite! Co-morbid illnesses have not been adequately defined in methods and would have been better quatified by using standard indices like the Charlson's Index.Whether the end point was in-hospital mortality is again not clear.

    Competing interests

    I have no competing interests

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