Table 2.

Frequency of use and ns for substance use variables for the analytical sample (n = 583).

	Frequency of use
	0	1	2	3	n
Cannabis use age 14	507	66	10	–	583
Cannabis use age 15	487	28	36	–	551
Cannabis use age 16	386	65	58	–	509
Cannabis use age 17	360	57	67	–	484
Cannabis use age 18	367	68	62	–	497
Tobacco use age 14	476	92	15	–	583
Tobacco use age 15	453	52	46	–	551
Tobacco use age 16	383	71	55	–	509
Tobacco use age 17	351	53	80	–	484
Tobacco use age 18	383	31	83	–	497
Alcohol use age 14	475	102	4	2	583
Alcohol use age 15	429	97	22	12	551
Alcohol use age 16	332	138	29	24	509
Alcohol use age 17	290	132	50	29	484
Alcohol use age 18	322	126	43	24	497
Opioid use age 19	483	12	1	–	496
Opioid use age 20	469	14	3	–	486
Opioid use age 21	478	16	1	–	495
Opioid use age 22	475	7	5	–	488
Opioid use age 23	464	7	7	–	478
Opioid use age 24	475	10	5	–	490
Opioid use age 25	474	7	5	–	486
Opioid use age 26	463	7	7	–	477