Table 4. Means and standard deviations for immediate and delayed recalls on test of logical memory.

Logical Memory	Methylphenidate				F	P
	Placebo	10 mg	20 mg	40 mg
Immediate Recall	31.44 ± 2.40	29.00 ± 6.36	28.11 ± 5.97	26.44 ± 5.32	1.42	0.25
Delayed Recall	27.78 ± 3.03	26.22 ± 6.76	25.33 ± 8.75	26.00 ± 5.45	0.23	0.86