Inter-Correlations between Tests of Intelligence in Students with Learning Disabilities

Tests of intelligence are a prelude to the diagnosis of specific learning disabilities. This study selected three commonly preferred performance measures, such as the Porteus Maze Test (PMT), Seguin Form Board (SFB), and Gesell Drawing Test (GDT), to examine their inter-correlations. A single-shot correlation survey design was combined with convenience sampling to determine the nature, direction, degree, and extent of co-variance of test scores between the chosen tests for an overall sample of 161 students with specific learning disabilities. The overall trends and concerning personal-demographic variables like age, gender, level of schooling, and type of curriculum, were investigated. For the overall sample (N: 161), the obtained mean SFB mental age of 109.79 (SD: 20.38), GDT mental age of 98.80 (SD: 20.07), and PMT mental age of 103.75 (SD: 29.07) months. The GDT appears to be estimating mental ages less by five points against the PMT, and by twelve points against the SFB in the targeted children. Analysis of inter-correlations between the test scores on pairs for the three tests of intelligence shows moderate to highly significant correlation (p: <0.05) ranging from 0.48 and 0.53, irrespective of which among them is used as anchor test. This means that they all possess good convergent validity for their regular use during clinical practice in the diagnosis of children with learning disabilities.