Fig. 1
Proportions (%) of sexual intercourse and risky sexual behavior among adolescents by tobacco and alcohol use days during the past 30 days. (A) sexual intercourse; (B) risky sexual behaviors
Fig. 1 | 樱花视频
Proportions (%) of sexual intercourse and risky sexual behavior among adolescents by tobacco and alcohol use days during the past 30 days. (A) sexual intercourse; (B) risky sexual behaviors