The need to adapt neuropsychological tests to population changes. An update of the Italian normative data for three tests: Rey-Osterrieth Complex Figure, Raven Coloured Progressive Matrices and COWAT -FAS.

Abstract

Objective: The study aims to update normative data for three of the tests which are most widely used in the Italian clinical services for dementia screening: the Rey-Osterrieth Complex Figure test, the Coloured Progressive Matrices test and the Controlled Oral Word Association test. In fact, the obsolescence of normative data is a crucial problem for cognitive tests, and their periodical updating is recommended because of the Flynn Effect: the longer the time which has passed since standardization, the greater the likelihood is that scores will overestimate real abilities.

Methods: A total of 364 neurologically healthy individuals (130 males/234 females; age ≥ 40, mean = 65.67 ± 10.29 years, education = 12.98 ± 3.88 years; MMSE score = 29.32 ± 1.11) were recruited from Rome and the surrounding area and divided into 8 groups by five-year age intervals (range 40-85 years). Linear models with modulating effects for age, education, and gender were applied to obtain the correction scores. Percentiles and Equivalent Scores were calculated as well.

Results: Normative data corrected for age, gender and education were obtained for the three tests. Decremental effects of age and incremental effects of education were confirmed, while mixed results were found for gender. When compared with previous Italian normative studies, a global increase in the mean scores was recorded.

Conclusions: The study provides updated scores for the Italian population for three tests widely used in clinical and experimental settings. The effects of aging, education, and gender on cognitive performance are confirmed, as well as the Flynn effect and the necessity for periodical updating of normative data for neuropsychological tests.