TABLE 1.

Part A) Predictors in the original models of reading, spelling, and maths and in the general cognitive factors model (from Zoccolotti et al., 2020). Part B) Percentage of total variance explained by different models.

PART A
	Original models	Reading fluency model	Spelling accuracy model	Calculation (fluency and accuracy) model	General cognitive factors model
	Predictors	- Orthographic Decision - RAN - Visual-auditory Pseudo-word Matching	- Orthographic Decision - Single Pseudo-word Repetition - Repetition of Pseudo-word Series	- Number Order - Arithmetic Facts - Computation Strategies	- Raven - Symbol Search - Backward Span - Verbal Phonemic Fluency
PART B
Dependent measures	Reading fluency	48.7	34.9	38.8	19.5
	Spelling accuracy	21.1	29.2	18.6	6.5
	Calculation speed	31.9	18.1	37.9	12.8
	Calculation accuracy	19.4	20.2	27.5	12.8

In particular, each specific set of predictors is used to predict the target behavior as well as all the other non-target behaviors. The variances explained by the “specific” predictions (i.e., reading predicted by predictors in the reading fluency model etc.) are marked in bold. For comparison, the variances accounted for by the general cognitive factors model are also presented.