TABLE 2.

Regression analyses showing gender and MCH/MCV/ferritin, as predictors of performance (scores) on the digit span test

	Cumulative		Simultaneous
Variable	R 2 change	F change	β	p
Step 1
Gender	0.05	F (1,106) = 5.43	−0.22	0.02
Step 2
MCH	0.14	F (1,105) = 18.08	0.37	0.000
Step 2
MCV	0.09	F (1,105) = 10.80	0.30	0.001
Step 2
Ferritin	0.03	F (1,105) = 3.78	0.18	0.05

Note: Gender: 1, male; 2, female.

Note: Results of “step 1” are the same for the three regression analyses performed.