Colin Ridyard


Colin is a Research Officer in Health Economics at the Centre for Health Economics & Medicines Evaluation at Bangor University.  He is currently working on two joint studies with Liverpool University Cancer Trials Unit (RIAltO and PACIFICO) and two joint paediatric studies with Liverpool University Clinical Trials Research Centre (SCIPI and CATCH). The CATCH study is also being done in conjunction with University College London Institute of Child Health. Colin’s particular field of interest lies in the application of hospital episode statistics data to health economic evaluations. He has also worked on the construction and design of the new DIRUM database – a repository of resource-use questionnaires for trial-based economic evaluations. This project has Bangor as the lead partner in collaboration with the Universities of Bristol, Birmingham, Vancouver Coastal Health Research Institute, and London School of Economics and Political Science. An R&D Chemist by training, Colin has spent sixteen years in the chemical industry working with active pharmaceutical ingredients and more recently, five years in the North West Wales NHS Trust Finance Department as a Modernisation Officer working on amongst other things, resource use databases. He obtained his degree from NEWI Deeside in 1991 and his PhD from the University of Exeter in 1996.

PUBLICATIONS (inc. Authors, title, journal, etc)

  • Ridyard CH, Plumpton CO, Gilbert R, Hughes DA. Cost-effectiveness of paediatric central venous catheters in the UK: A secondary publication from the CATCH clinical trial. Frontiers in Pharmacology. 2017;8:644.
  • Thorn JC, Brookes ST, Ridyard C, Riley R, Hughes DA, Wordsworth S, Noble SM, Thornton G, Hollingworth W. Core Items for a Standardized Resource Use Measure (ISRUM): Expert Delphi Consensus Survey. Value in Health. 2017 Sep 1.
  • Ridyard CH, Dawoud DMM, Tuersley LV, Hughes DA. A Systematic Review of Patients’ Perspectives on the Subcutaneous Route of Medication Administration. Patient. 2016. DOI 10.1007/s40271-015-0160-x
  • Hughes D, Charles J, Dawoud D, Edwards RT, Holmes E, Jones C, Parham P, Plumpton C, Ridyard C, Lloyd-Williams H, Wood E, Yeo ST. Conducting economic evaluations alongside randomised trials: Current methodological issues. Pharmacoeconomics. 2016 Jan. DOI 10.1007/s40273-015-0371-y
  • Harron K, Mok Q, Dwan K, Ridyard C, Moitt T, Millar M, Ramnarayan P, Tibby S, Muller-Pebody B, Hughes D, Gamble C, Gilbert R. CATheter Infections in CHildren (CATCH): a randomised controlled trial and economic evaluation comparing impregnated and standard central venous catheters in children. Southampton (UK): NIHR Journals Library; 2016 Mar. (Health Technology Assessment, No. 20.18.) Available from: doi: 10.3310/hta20180
  • Thorn J, Ridyard C, Riley R, Brookes S et al. Identification of items for a standardised resource-use measure: review of current instruments. Trials 2015 16(Suppl 2):O26 DOI: 10.1186/1745-6215-16-S2-O26
  • Ridyard CH, Hughes DA, DIRUM Team. Taxonomy for methods of resource use measurement. Health Econ. 2015; 24: 372-8.
  • Ridyard CH, Hughes DA, DIRUM Team. Review of resource-use measures in UK economic evaluations. In: PSSRU Unit Costs of Health and Social Care 2015: 22-31. Compiled by Lesley Curtis and Amanda Burns. University of Kent 2015
  • Blair J, Gregory JW, Hughes D, Ridyard CH, Gamble C, McKay A, Didi M, Thornborough K, Bedson E, Awoyale L, Cwiklinski E, Peak M. Study protocol for a randomised controlled trial of insulin delivery by continuous subcutaneous infusion compared to multiple daily injections. Trials. 2015 Apr 16;16(1):163
  • Thorn JC, Coast J, Cohen D, Hollingworth W, Knapp M, Noble SM, Ridyard CH, Wordwworth S, Hughes D. Resource-use measurement based on patient recall: issues and challenges for economic evaluation. Applied health economics and health policy. 2013; 11: 155-61.
  • Blair J, Awoyale L, Thornborough K, Peak M, Didi M, Bedson E, Hughes D, Ridyard C, Tat T, Gregory J. Screening log data can be used to inform protocol modifications, increasing patient recruitment to a challenging clinical trial. Endocrine Abstracts (2013) 33 P59.
  • Ridyard C, Hughes D. Review of the use of resource use instruments based on patient recall in relation to other methods of resource use estimation. Trials. 2013; 14: O22.
  • Ridyard C, Dawoud D, Hughes D. A Systematic Review of Patient Preferences for Subcutaneous Medications. Value in Health. 2013; 16: A335-6.
  • Ridyard C, Linck P, Hughes D. Review of the Use of Resource Use Instruments Based on Patient Recall in Relation to Other Methods of Cost Estimation. Value in Health. 2013; 16: A466-.
  • Ridyard CH, Hughes DA, DIRUM Team. Development of a database of instruments for resource-use measurement: purpose, feasibility, and design. Value Health. 2012; 15: 650-5.
  • Ridyard CH, Hughes DA. Methods for the collection of resource use data within clinical trials: a systematic review of studies funded by the UK Health Technology Assessment program. Value Health. 2010; 13: 867-72.

GRANT CAPTURE (inc. title and brief summary of Project)

Colin has worked with Professor Dyfrig Hughes to secure funds from the Medical Research Council Network of Hubs for Trial Methodology Research (MRC HTMR) to compile a Database of Instruments for Resource Use Measurement (DIRUM). The aim of the DIRUM project is to create a practical, open-access database of resource-use questionnaires for use by trial health economists.