Table 1.

Demographics and Substance Use Characteristics

	Cannabis Users (n=66) M/% (SD) range	Controls (n=37) M/% (SD) range	Whole Sample (n=103) M/% (SD) range
Age	19.3 (1.5)	18.6 (1.6)	19.0
	16–22	16–22	16–22
Education	12.8 (1.4)	12.3 (1.6)	12.6 (1.5)
	10–16	9–16	9–16
% Female	39%	49%	43%
% Hispanic	53%	35%	47%
% Caucasian	53%	46%	50%
Days since last cannabis use	3.73 (5.6)	255.5 (506.4)	50.4 (234)
	0–27	37–2016	0–2016
	n=66	n=15	n=81
Past month cannabis use (episodes)	37.88 (97.7)	0 (0)	24.5 (80.5)
	1–798	0–0	0–798
Lifetime quantity of cannabis use (episodes)	868.1 (1883.6)	32.6 (129.3)	573 (1565)
	3–14566	0–771	0–14566
Age of first cannabis use	16 (2)	16.6 (1.5)	16.1 (2)
	10–21	15–19	8–20
	n=66	n=15	n=81
Age of first regular cannabis use	17.5 (1.7)	16.3 (.6)	17.5 (1.7)
	13–21	16–17	13–21
	n=62	n=3	n=65
Urinary THCCOOH concentration (ng/mL)	140.8 (209.8)	0 (0)	178 (222)
	0–1069	0–0	0–1069
	n=52		n=52
Age of first NTP use	16.4 (2)	16.1 (1.3)	16.4 (1.9)
	11–12	14–18	11–21
	n=52	n=14	n=66
Age of first regular NTP use	17.9 (1.8)	17 (1.3)	17.7 (1.8)
	15–22	14–18	14–22
	n=25	n=9	n=34
# Past-Month NTP Users	n=32	n=11	n=43
Past month NTP use (episodes)	71.1 (297.5)	20.1 (65.8)	52.7 (234)
	0–2106	0–360	0–2106
Lifetime nicotine use (episodes)	1142.5	1120.6	1135
	(3336.9)	(5450.3)	(4193)
	0–21700	0–33091	1–33091
Urinary Cotinine concentration (ng/mL)	20.9 (78.6)	30.2 (80.6)	89.3 (133)
	0–500	0–307	0–500
	n=21	n=7	n=28
Age of first alcohol use	16 (2)	15.6 (2.7)	15.8 (2.2)
	11–20	8–19	8–20
	n=64	n=25	n=89
Past month alcohol use (episodes)	4.9 (5.1)	3.2 (4.9)	4.3 (5.1)
	0–21	0–17	0–21
Lifetime alcohol use (episodes)	158.5 (225.1)	78.3 (173.0)	130 (211)
	0–978	0–792	0–978
Days since last alcohol use	19.7 (46.6)	46.7 (146.7)	27.26 (87)
	1–294	0–730	0–730
Lifetime other drug use (episodes)	6.5 (23.1)	.8 (2.8)	4.4 (18.8)
	0–183	0–17	0–183
Days since last other drug use	284 (441.7)	309.2 (359.2)	288.4 (425.5)
	2–2555	24–1095	2–2555
# used other drug in past month	n=8	n=1	n=9

Notes: sample size (n) indicated for number of participants who endorsed a response when it was not endorsed by all participants with one or both groups (e.g., not all Controls had used cannabis and so did not endorse an age of first use, never having used previously).