Table 6. Digit Symbol Substitution Test data of men and women before, during, and after 4 h of gaming.

Variable	Caffeine	AmaTea®	Placebo
Correct responses
Hour 0*	65±9	65±11	66±10
Hour 1	68±8	68±9	68±10
Hour 2	69±9	69±9	68±10
Hour 3	71±9	70±10	70±9
Hour 4	71±9	71±10	69±10

Values are mean±SD.

^*Time effect (P<0.0001); Values higher at h 2, 3, and 4 than h 0 (P<0.05). No other differences of statistical significance were noted (P>0.05).