TABLE 2.

Percentage of “true variance” explained by models based on different sets of predictors i.e., total variance values adjusted for the reliability values of the four dependent measures.

		Predictors
		Reading fluency model	Spelling accuracy model	Calculation (fluency and accuracy) model	Cognitive abilities model
Dependent measures	Reading fluency	57.3	41.1	45.6	22.9
	Spelling accuracy	28.1	38.9	24.8	8.7
	Calculation speed	40.9	23.2	48.6	16.4
	Calculation accuracy	38.8	40.4	55.0	25.6

The reliability values were the following: Reading fluency: r = 0.85; Spelling accuracy: r = 0.75; Calculation speed = 0.78; calculation accuracy = 0.50. The true variance explained by the “specific” predictions (i.e., reading dependent measure predicted by reading predictors etc.) are marked in bold.