Development and inter-rater reliability of the Liverpool adverse drug reaction causality assessment tool

Ruairi M Gallagher, Jamie J Kirkham, Jennifer R Mason, Kim A Bird, Paula R Williamson, Anthony J Nunn, Mark A Turner, Rosalind L Smyth, Munir Pirmohamed

Research output: Contribution to journalArticlepeer-review

Abstract

AIM: To develop and test a new adverse drug reaction (ADR) causality assessment tool (CAT).

METHODS: A comparison between seven assessors of a new CAT, formulated by an expert focus group, compared with the Naranjo CAT in 80 cases from a prospective observational study and 37 published ADR case reports (819 causality assessments in total).

MAIN OUTCOME MEASURES: Utilisation of causality categories, measure of disagreements, inter-rater reliability (IRR).

RESULTS: The Liverpool ADR CAT, using 40 cases from an observational study, showed causality categories of 1 unlikely, 62 possible, 92 probable and 125 definite (1, 62, 92, 125) and 'moderate' IRR (kappa 0.48), compared to Naranjo (0, 100, 172, 8) with 'moderate' IRR (kappa 0.45). In a further 40 cases, the Liverpool tool (0, 66, 81, 133) showed 'good' IRR (kappa 0.6) while Naranjo (1, 90, 185, 4) remained 'moderate'.

CONCLUSION: The Liverpool tool assigns the full range of causality categories and shows good IRR. Further assessment by different investigators in different settings is needed to fully assess the utility of this tool.

Original languageEnglish
Pages (from-to)e28096
JournalPLoS ONE
Volume6
Issue number12
DOIs
Publication statusPublished - 2011

Keywords

  • Adverse Drug Reaction Reporting Systems/standards
  • Causality
  • Decision Making
  • Humans
  • Observer Variation
  • Reproducibility of Results

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