Table 1.

Characteristics of Students, 2005–2015 pooled YRBS, by sex (N=348,175).

	Females (n=181,430)			Males (n=166,745)
Variable	#	%		#	%
Demographics:
LCA Group
Class 1	7168	4.6		69339	42.35
Class 2	9325	4.71		82286	49.09
Class 3	67376	37.94		3667	1.98
Class 4	81525	44.07		3899	2.14
Class 5	16036	8.67		7554	4.43
Race/Ethnicity
American Indian/Alaskan Native	2518	0.96		2896	1.19
Asian	12070	5.6		11882	5.98
Black	31398	15.02		26976	13.92
Hispanic/Latino	46235	26.73		41399	26.55
Native Hawaiian/Other Pacific Islander	2869	0.77		2833	0.88
White	77463	47.5		73473	48.44
Multiple Races	8877	3.44		7286	3.05
Age (years)
14 or younger	31316	13.24		26150	11.77
15	47349	26.15		41883	25.5
16	46654	25		42860	25.04
17	40396	23.26		37842	23.31
18 or older	15715	12.35		18010	14.38
Tobacco Use:
Age of Onset
8 or younger	2486	5.71		4458	9.52
9 or 10	2530	5.86		3122	8.3
11 or 12	5742	16.1		5880	14.83
13 or 14	12575	33.61		10934	30.5
15 or 16	9938	29.89		9327	27.96
17 or younger	2151	8.84		2566	8.89
Persistence
Yes	10724	30.63		11279	35.2
No	25776	69.37		22732	64.8
Frequency
0 days	157842	90.63		139738	88.0
1 or 2 days	5877	3.31		5290	3.81
3 to 5 days	2719	1.47		2666	1.79
6 to 9 days	1684	1.00		1860	1.2
10 to 19 days	1842	0.91		2058	1.29
20 to 29 days	1433	0.8		1684	1.07
All 30 days	3687	1.88		4993	2.86
Alcohol Use:
Age of Onset
8 or younger	7637	6.68		10958	10.44
9 or 10	6603	5.38		7825	7.96
11 or 12	14365	12.12		13629	13.75
13 or 14	38090	35.46		28769	31.86
15 or 16	32388	33.7		24345	29.69
17 or younger	5169	6.65		4566	6.3
Persistence
Yes	32788	52.88		27085	52.44
No	28136	47.12		23738	47.56
Frequency
0 days	113543	66.97		106456	69.74
1 or 2 days	31666	18.74		22513	14.61
3 to 5 days	12889	7.77		11177	7.27
6 to 9 days	6311	3.68		6289	4.35
10 to 19 days	3168	2.02		3637	2.51
20 to 29 days	743	0.45		934	0.58
All 30 days	717	0.36		1877	0.93
Marijuana Use:
Age of Onset
8 or younger	1532	2.27		3923	5.18
9 or 10	1864	2.28		3441	4.88
11 or 12	7237	10.53		9147	14.06
13 or 14	25362	39.18		23213	37.83
15 or 16	22421	37.73		18151	30.92
17 or younger	3630	8.02		3200	7.13
Persistence
Yes	23091	54.43		24740	58.54
No	19462	45.57		17022	41.46
Frequency
0 times	144421	80.4		125738	77.65
1 or 2 times	13786	8.13		10447	6.66
3 to 9 times	9021	5.27		8449	5.23
10 to 19 times	4211	2.42		4963	2.96
20 to 39 times	2678	1.56		3917	2.35
40 or more times	4119	2.22		8396	5.15

Unweighted frequencies (#) are provided; percent (%) reflect adjusted sampling weights