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Author response

Published online by Cambridge University Press:  02 January 2018

Ashimesh Roychowdhury  and
Gwen Adshead
Ashimesh Roychowdhury
Affiliation:
St Andrew's Healthcare, Northampton, email: [email protected]
Gwen Adshead
Affiliation:
St Andrew's Healthcare, Northampton, email: [email protected]
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The Psychiatric Bulletin , Volume 38 , Issue 4 , August 2014 , pp. 196
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Copyright © Royal College of Psychiatrists, 2014

We thank Dr Matthew Large for his helpful comments. We wished to respond only by clarifying that the figures in Table 2 were from a hypothetical population, based on a hypothetical risk assessment tool with certain sensitivity and specificity values. The purpose was to illustrate that, even in risk assessments with unrealistic accuracy levels, the positive predictive value (PPV) was still low, as it was greatly influenced by the base rate. Any misleading odds ratios arising from the table was not intentional and arose (perhaps ironically) by chance.

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