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Erratum to: Statistics review 3: Hypothesis testing and Pvalues

The original article was published in Critical Care 2002 6:222

An erratum to Statistics review 3: Hypothesis testing and Pvalues, by Elise Whitley and Jonathan Ball.

In the original version of this article [1], the words 'if the null hypothesis is true' were omitted from the first sentence of the first key message. The key message should have read as follows:

'A P value is the probability that an observed effect is simply due to chance, if the Null hypothesis is true; it therefore provides a measure of the strength of an association. A P value does not provide any measure of the size of an effect, and cannot be used in isolation to inform clinical judgement.'


  1. 1.

    Whitley E, Ball J: Statistics review 3: Hypothesis testing and P values. Crit Care. 2002, 6: 222-225. 10.1186/cc1493.

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Correspondence to Elise Whitley or Jonathan Ball.

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The online version of the original article can be found at 10.1186/cc1493

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