Table 2. Comparison of Response Rates in Three Dose Groups.

Dose group	Response/responder rate		P-valuea
	n	%
Placebo	3	12.5
0.2 mg/kg	9	39.1	0.03
0.5 mg/kg	11	45.8

Response (⩾50% reduction of HAMD score from baseline at any two daily HAMD-17 measures during the period of 24 to 96 h after infusion).

^aFisher’s exact test.