Table 1.

Sample Demographics, Referral, and Metabolism Characteristics

Variable	Mean (SD)	Range
Age (yr)	12.18 (4.2)	2.9–22.6

Variable	Count	%
Sex
Female	63	31
Male	139	69
Race
Black/African American	18	9
White	168	83
Others	10	5
Ethnicity
Hispanic/Latino	4	2
Non-Hispanic/Latino	198	98
Referral reason
ADR	98	49
Poor medication response	131	66
Genotype result review	5	2
Genotyping requested by the physician	29	14
Genotyping requested by the family	25	12
Others	44	22
Referral source
Primary care provider	34	16
Subspecialist	158	78
Self-referral	10	5
CYP2C19 statusa
Poor	4	3
Intermediate	39	29
Normal	76	57
Rapid/ultrarapid	15	10
Missing	68	—
CYP2D6 statusa
Poor	13	9
Intermediate	75	56
Normal	89	66
Rapid/ultrarapid	1	0.7
Missing	24	—

^aPercentages were calculated based on the available number of genotype results for each enzyme.