• Scand J Trauma Resus · Jan 2017

    Comment Letter

    External validation of a clinical decision rule: we need events in a population in order to rule them out!

    • Yonathan Freund and Anne-Laure Philippon.
    • Emergency Department, hôpital Pitié-Salpêtrière, Paris, France. yonathanfreund@gmail.com.
    • Scand J Trauma Resus. 2017 Jan 13; 25 (1): 3.

    AbstractWe respond to the Lorton et al. article on external validation of the PECARN study. With an event rate of only 0.6%, we believe that their study failed to confirm the safety of this rule. Such a low number of events should call for caution when interpreting the results of diagnostic tests.

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