Page last updated 13/11/17 10:10:10

Information about the YP-CORE

As noted elsewhere, the CORE-SF/A, with the CORE-SF/B, were the only short forms alongside the CORE-OM in the suite of instruments at the launch of the system in 1998. At the time of the launch we recognised that practitioners working with children and adolescents would not find those measures appropriate for their clientèle except at the upper end of the teen age range and hoped to produce a measure usable down to say twelve years of age (recognising that there is no precise age below which self-report measures become unreliable but also recognising that it simply isn’t possible to use one measure for eight year olds and for sixteen year olds).

As with the development of the adult oriented instruments, there was great support for this within the practitioner group.  An early attempt, the teen-CORE, was abandoned when it became clear that more substantial changes from the CORE-OM template were needed and, after a lot of work by many people, with particular input from Professor Mick Cooper, the 10 item YP-CORE was the result.  All the items map from CORE-OM items but almost all have been reworded to improve fit to the age group (and the selection of items was obviously tuned by work with practitioners and clients to the age group).  There are no domain scores and prorating of up to one missing item is appropriate.


The canonical reference to the YP-CORE, with some initial psychometric exploration in UK clinical and non-clinical samples using the English version is:

A much more detailed paper on the English YP-CORE based on significantly larger samples has since been published:

Twigg, Elspeth, Mick Cooper, Chris Evans, Elizabeth S. Freire, John Mellor-Clark, Barry McInnes, and Michael Barkham. 2016. ‘Acceptability, Reliability, Referential Distributions, and Sensitivity to Change of the YP-CORE Outcome Measure: Replication and Refinement’. Child and Adolescent Mental Health 21 (2): 115–23. doi:10.1111/camh.12128. 

This showed nicely that the psychometric properties alter a bit by both age and gender. The differences are not huge, but entirely congruent with the huge changes, many of them gender related, going on in adolescence, and they are of sufficient magnitude to need different Jacobson & Truax type “Clinically Significant Change” cutting points for 11-13 and 14-16 year olds, and different ones for the males and females.  As I’m a co-author on that paper and did the analyses, I think I can send a copy to anyone who wants one for their own personal use, use the “Contact us” form to Email me asking for a copy or with any other questions or comments about the YP-CORE.

Emily Blackshaw’s PhD and developing an international YP-CORE network

Working with myself, Prof. Mick Cooper and Dr. Gina Pauli in the University of Roehampton’s CREST research unit Emily is doing her PhD around the YP-CORE and she has created a ResearchGate project page for this YP-CORE: Psychometric properties and utility.  Do click on that (should open in a new tab) and sign up to follow that (I think you’ll have to sign up with ResearchGate but that’s free).  Emily’s focus is mainly on the YP-CORE in English and in the UK but we’re very interested to link up with others using the YP-CORE anywhere and, with Vera Gergov who led the translation of the YP-CORE into Finnish, and with Aileen O’Reilly of the excellent Jigsaw service for young people in Ireland and others who have translated the YP-CORE or are working on or planning that, we’re hoping to start an international YP-CORE network in 2018.

Paying attention to live events and stressors impinging during therapies

Emily and I are particularly interested in the psychometrics of the YP-CORE (and other measures) when they are used frequently and often as in the current enthusiasm for measures to be completed weekly during therapy.  One thing that concerned us is that intercurrent events and stressors are usually simply rolled into the “noise”/”error” component when change is modelled and that seems simply wrong so we’re looking into this and have had a paper reviewing this for the field of therapies with young people accepted.  If you’re signed up to the CST announcements Email list you’ll be among the first to know when that paper is published.  Sign up information is in the footer at the bottom of all pages on this site.


Download the English language PDF of the YP-CORE using link below, for other languages, read on further below.

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Translations of the YP-CORE

Good authorised translations to our translation policy and procedure have been completed for the languages below.

I will keep this page updated as translations of the YP-CORE are finished.  Links will take you to more information though the PDFs are not yet necessarily directly downloadable if psychometric exploration is still underway.

  • Welsh
  • Czech
  • Italian
  • Finnish (a peer-reviewed publication about the psychometric properties of the Finnish YP-CORE has been published)
  • Spanish
  • Croatian
  • Portuguese
  • Romanian
  • Chinese
  • Danish

Further links and further translations will be added as they become available and as I have time to do the work mounting them.  Subscribe to the site’s Email update list if you want to be alerted to such additions. The subscribe option is on the footer of every ordinary page on the site.  For more general information about translations and about translations of other CORE instruments, go to the Translations page.

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