Quebec French Version of the Hayling Sentence Completion Test: Error Scoring Guidelines, Normative Data for Adults and the Elderly and Validation Study in Mild Cognitive Impairment and Alzheimer's Disease

Introduction Deficits in inhibition have been associated with various clinical conditions, including neurodegenerative diseases. The Hayling Sentence Completion Test (HSCT) is an assessment tool commonly used in clinical settings to measure verbal initiation and prepotent verbal response inhibition. Although it is used by numerous clinical and research groups in Quebec, normative data for the HSCT are not yet available for French-Quebec speakers.Objectives The aims of this study were to provide error scoring guidelines and normative data in the adult population of French Quebec for the HSCT-QC (Study 1) and to determine its known-group discriminant validity (Study 2).Results The results of Study 1, based on a sample of 214 healthy individuals aged 50 to 89, indicated that age significantly affected test performance, while educational level and sex did not. As no transformations were able to normalize the score distribution, percentile ranks for HSCT-QC performance were calculated solely based on age. Results from Study 2 demonstrated that the HSCT-QC effectively distinguishes the performance of healthy participants from those with mild cognitive impairment or Alzheimer's disease.Conclusion Norms and psychometric data for the HSCT-QC will be highly beneficial for assessing inhibitory control in French-speaking adults in Quebec, Canada.