TABLE 3.

Regression analyses showing gender and MCH/MCV/ferritin, as predictors of performance (percent of errors) on the switching task

	Switch condition				Non‐switch condition
	Cumulative		Simultaneous		Cumulative		Simultaneous
Variable	R 2 change	F change	β	p	R 2 change	F change	β	p
Step 1
Gender	0.00	F (1,106) = 0.17	0.04	N.S.	0.00	F (1,106) = 0.08	0.03	N.S.
Step 2
MCH	0.09	F (1,105) = 9.77	−0.29	0.002	0.06	F (1,105) = 7.17	−0.25	0.009
Step 2
MCV	0.04	F (1,105) = 4.78	−0.21	0.03	0.03	F (1,105) = 3.15	−0.17	N.S.
Step 2
Ferritin	0.07	F (1,105) = 8.14	−0.27	0.005	0.08	F (1,105) = 8.51	−0.27	0.004

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

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