Any statistical significance with the score difference >0.99 SD was defined as a presence of cognitive decline. Fluid ability minus crystallized ability was used to assess the cognitive impairment.
Standardized score was used for discrepancy analysis. They were assessed on extensive thirteen cognitive tests and one subjective test of cognition. Methods: This analysis of data from LASI-DAD study was carried out on a sample of 3,223 participants. Aim: The aim of the study was to identify the variables of gc and gf from a population data of Longitudinal Aging Study in India-Diagnostic Assessment of Dementia (LASI-DAD) study and investigate its relationship with the onset of cognitive impairment using discrepancy analysis against neuropsychological tests. The association of the two with cognitive decline remains a matter of conjecture requiring further research. Crystallized intelligence (gc) tends to be maintained, as opposed to fluid intelligence (gf), which tends to decline rapidly with age. Background: Cognitive aging is a complex phenomenon, which comprises various cognitive skills, broadly categorized into fluid and crystallized intelligence.
