Table 3.

Hierarchal regression analysis of SDMT performance

Model	R	R2	ΔR2	Significance
1a	0.283	0.080	0.063	p = 0.038
2b	0.312	0.097	0.062	p = 0.331
3c	0.322	0.103	0.049	p = 0.404
4d	0.335	0.112	0.059	p = 0.361
5e	0.768	0.590	0.543	p < 0.001
6f	0.902	0.813	0.786	p < 0.001

^aGroup;

^bGroup*HADS-Depression;

^cGroup*HADS-Depression*Years of Education

^dGroup*HADS-Depression*Years of Education*Mean Saccade Distance in the key area

^eGroup*HADS-Depression*Years of Education*Mean Saccade Distance in the key area*Number of Visits to the Key per response;

^fGroup*HADS-Depression*Years of Education*Mean Saccade Distance in the key area * Number of Visits to the Key per response* Total number of fixations in test area