Table 2.

Equations for predicting test results from age and education years

Test	Equation	SD
NCT-A	27.861 + 0.548 × age - 0.821 × education	7.581
NCT-B	42.816 + 0.672 × age - 0.971 × education	9.173
SDT	38.937 + 0.113 × age - 0.423 × education	2.408
LTT	33.242 + 0.182 × age - 0.559 × education	3.455
DST	63.020 - 0.672 × age + 1.421 × education	10.608

NCT-A: Number connection test-A; NCT-B: Number connection test-B; SDT: Serial dotting test; LTT: Line tracing test; DST: Digit symbol test; Age and education are expressed in years.