An investigation into the intra and inter rater scoring reliability of the Addenbrooke’s Cognitive Examination-III

At Time 1, 20% of participants' scores matched the true score, with 32% deviating by 3-5 points, and an overall range of 10 points. At Time 2, 24% of scores matched the true score, with 11% deviating by three points, and an overall range of six points. Errors were mainly accounted for by the domains requiring subjective judgements, namely the visuospatial and language subtests. Intra-rater consistency was low to moderate. Previous experience of using the ACE-III, nor previous ACE-III training, led to statisically significant differences in scoring performance. Health professionals should consider these findings when scoring the ACE-III and utilize the ACE-III administration and scoring guide to improve accuracy.