Table. Generalized Estimating Equations for Visual Search Saccadic Reaction Times Predicted by Concurrent Usage Group, Visit, Search Type, and Set Size.

Characteristic	Wald χ2	P value
Main model including search type
Visit	11.46	.001
Search type	119.62	<.001
Set size (5 vs 9)	6.07	.01
Group	9.83	.002
Visit × set size	0.33	.57
Visit × search type	2.74	.10
Visit × group	0.38	.54
Search type × set size	4.06	.04
Set size × group	0.005	.94
Search type × group	1.89	.17
Visit × search type × set size	2.00	.16
Visit × set size × group	0.01	.91
Visit × search type × group	0.85	.36
Search type × set size × group	0.09	.77
Visit × set size × search type × group	4.01	.045
Follow-up model restricted to single search
Visit	13.41	<.001
Set size (5 vs 9)	2.73	.10
Group	10.45	.001
Visit × set size	0.61	.44
Visit × group	<0.001	.99
Set size × group	0.006	.94
Visit × set size × group	2.94	.09
Follow-up model restricted to conjunction search
Visit	1.17	.28
Set size (5 vs 9)	6.15	.01
Group	0.12	.73
Visit × set size	1.55	.21
Visit × group	0.05	.82
Set size × group	<0.001	>.99
Visit × set size × group	1.10	.30