Table 1.

Groups of subjects in this PET study

Study	Group	Drug	Age (years)	Number of subjects	PET scanner	Study type
1	1	E	24.0 ± 0.4	6	SET 2400W	Single-blind, randomized and crossover study
		C2
	2	ND	24.3 ± 0.9	6
2	3	C6	21.5 ± 0.2	6	PT931	Single-blind study
	4	P	21.5 ± 0.4	6
Total			22.8 ± 0.4	24

E: ebastine 10 mg, C2 and C6: (+)-chlorpheniramine 2 and 6 mg, ND: nondrug treatment, P: placebo.