Table 1.

Characteristics of the participants, YRBSS (N= 66,882)

Variable	Weighted n	%
Age
12 years old or younger	57	0.08
13 years old	60	0.09
14 years old	7251	10.84
15 years old	17,140	25.63
16 years old	17,600	26.32
17 years old	15,683	23.45
18 years old or older	9056	13.54
Missing	36	0.05
Grade
9th grade	19,411	29.02
10th grade	17,472	26.12
11th grade	15,533	23.22
12th grade	14,248	21.30
Ungraded or other grade	76	0.11
Missing	142	0.21
Sex of subject
Female	33,063	49.43
Male	33,716	50.41
Missing	103	0.15
Race
Caucasian	44,386	66.36
African American	10,062	15.04
Hispanic	10,077	15.07
Asian	2357	3.52
Missing	0	0.00
Age of first sexual intercourse
Never had sexual intercourse	32,032	47.89
11 years old or younger	2170	3.24
12 years old	2062	3.08
13 years old	3802	5.69
14 years old	6167	9.22
15 years old	6779	10.14
16 years old	5146	7.69
17 years old or older	2539	3.80
Missing	6186	9.25