38 Craft Story 21, Argentine Baremization of a Memory test and Design of a Recognition Instance.
Authors: Carello Maria Agostina , Corvalän Nicolas , Keller Greta , Arruabarrena Micaela Maria , Palermo Cecilia , Canyazo Carlos Alberto Martinez , Calandri Ismael Luis , Allegri Ricardo Francisco , Crivelli Lucia 
Published: December 2023

Objective:Craft Story 21 is a practical, comprehensive, and freely available tool to assess logical memory in patients with memory impairment. Currently, the test does not have normative values in Spanish that adjust to our specific population. Furthermore, the original test does not have a recognition phase to increase the specificity of the memory profile by allowing a distinction between different amnesic profiles. Therefore, this study has two main aims: 1) the generation of normative data for the Craft Story 21 memory test, adjusting to the characteristics of our Spanish-speaking country according to sex, age, and educational level; and 2) the design and validation of the recognition phase of the test and the assessment of its psychometric properties.Participants and Methods:The baremization sample comprised 81 healthy participants aged 41 to 91, assessed through the Uniform Data Set III (UDS III) battery of the National Alzheimer’s Coordinating Center (NACC). The design of the recognition phase included three steps: (1) construction of the scale and review by experts, (2) pilot study, and (3) analysis of its psychometric properties. In the latter, 190 participants were recruited and classified into two groups matched by age, sex, and educational level: Mild Cognitive Impairment (MCI n=96) according to Petersen’s (1999) criteria and healthy controls (HC n=94). In addition, the diagnostic accuracy of the test was studied by the ROC curve method, its concurrent validity by correlation with other memory tests (RAVLT), and its internal consistency with Cronbach’s alpha test.Results:The Baremization sample was divided into 16 groups: 4 age groups (41-51, 51-61, 6171 and >72 years), two educational levels (6-12 years and >12 years), and sex (male and female). Performance was significantly different between age groups (p < 0.003**). No significant differences were found in Craft Story 21 performance between education (p > 0.09) or sex (p > 0.56) groups within the same age group. Normative values in terms of means and standard deviations are presented for each group. Regarding the design of the recognition phase, the groups did not show significant differences in age (p= 0.13), sex (p= 0.88), or schooling (p= 0.33). The overall score of Craft Story 21 test showed the ability to discriminate between healthy controls from patients with MCI (sensitivity = 81.6% and specificity = 72.4%). Its diagnostic accuracy by phase (immediate AUC= 0.86; delayed AUC= 0.86 and recognition AUC= 0.75) was superior than Rey Auditory and Verbal Learning Test (RAVLT): immediate (AUC= 0.79), delayed (AUC= 0.82) and recognition (AUC= 0.74). It presented evidence of concurrent validity with RAVLT in its immediate (r=0.56, p<0.001), delayed (r= 0.66, p<0.001) and recognition (r= 0.37, p<0.001) trails. The instrument also presented evidence of reliability (a= 0.82).Conclusions:The Craft Story 21 test is a practical, brief and multicultural scale. Thus having appropriate scales for the specific population to be assessed to a more accurate and precise description of the memory profile. Additionally, the new Recognition phase of the test showed evidence of validity and reliability for assessing memory processes.