Table 3.

Frequency and cumulative percentage of youth with experience of first-time substance use (N = 3449).

Age	Alcohol Drinking		Cigarette Smoking
	Frequency	Cumulative (%)	Frequency	Cumulative (%)
6	5	0.14	0	0
7	7	0.35	2	0.06
8	4	0.46	2	0.12
9	4	0.58	3	0.2
10	15	1.01	5	0.35
11	16	1.48	5	0.49
12	72	3.57	23	1.16
13	194	9.19	70	3.19
14	211	15.31	80	5.51
15	534	30.79	275	13.48
16	340	40.65	133	17.34
17	416	52.71	140	21.4
18	322	62.05	130	25.17
19	321	71.35	101	28.1
No experience up to 19	988	-	2480	-

Note: Adopted from Table 2 of Han and Grogan-Kaylor [40].