Young Person’s Clinical Outcomes in Routine Evaluation (YP-CORE) Scale
: Psychometric Properties and Utility

  • Emily Blackshaw

Student thesis: Doctoral Thesis


The YP-CORE was developed as a freely-available, standardised, youth-friendly outcome measure of psychological distress. The overarching aim of this thesis was to assess the psychometric qualities of the YP-CORE, beyond that reported in two initial validation studies (Twigg et al., 2009, 2016). Study 1 explored the psychometric properties of the YP-CORE in non-help-seeking samples, with data collected from three UK secondary schools across five weeks, and at six-month follow-up. Study 2 of the thesis explored the properties of the YPCORE in help-seeking samples using pre-existing data collected from three services in the UK and Ireland. Study 3 expanded the first study, by considering the role of life events in YP-CORE score change. As part of Study 3, a novel life events measure (‘What’s Going On?’) was developed. This research found the YP-CORE to be broadly acceptable to young people, to be internally consistent, and to have a two-factor structure of positively and negatively worded items. There was also evidence to support convergent validity with the SDQ and RCADS-25, and test—retest stability. New indices of clinically significant and reliable change are proposed. The findings suggest different patterns of sessional change across an intervention for young people based on their initial level of distress and their age. The findings also suggest that life events have a predictive influence on scores on the YPCORE over time. Taken together, this research provides original and significant insights into the properties and utility of the YP-CORE.
Date of Award22 Oct 2021
Original languageEnglish
Awarding Institution
  • University of Roehampton
SponsorsUniversity of Roehampton Vice-Chancellor’s Scholarship
SupervisorMick Cooper (Director of Studies), Gina Pauli-Jones (Co-Supervisor) & Christina Evans (Co-Supervisor)


  • life events
  • outcome measurement
  • psychological distress
  • children and young people
  • youth mental health
  • psychometric

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