Table 3.

THC-COOH in urine samples, by day

	THC-COOH concentration in ng/mL (range)	THC-COOH concentration in µg/g creatinine (range)	Percent detected (number)#
Day 1 (n = 28)	ND*–0.015	ND*–0.019	3.5% (1)
Preconcert urine (n = 14)	ND	ND	0% (0)
Postconcert urine (n = 14)	ND–0.015	ND–0.019	7% (1)
Day 2 (n = 30)	ND–0.92	ND–0.44	47% (14)
Preconcert urine (n = 15)	ND–0.92	ND–0.44	33% (5)
Postconcert urine (n = 15)	ND–0.70	ND–0.22	60% (9)
Total (n = 58)	ND–0.92	ND–0.44	26% (15)

^*ND = not detected, below the limit of detection of 0.015 ng/mL.

^†ND = not detected, below the limits of detection of 0.015 ng/mL for THC-COOH and 1.1 mg/deciliter for creatinine.

^#Among the total urine samples represented in the Table row, the percent (number) in which THC-COOH was detected.