Table. Risky behavior among German adolescents, in percent.

Behavioral domains	Boys	Girls	Age range
Substance abuse Current smoking Regular alcohol use Current cannabis use Curent use of other illegal drugs	20.5 38.6 9.2 <0.5	20.3 22.2 6.2 <0.5	KiGGS*1: 11−17 years
Delinquency Aggressive and dissocial behavior	7.9	7.2	BELLA*2: 7−17 years
Violence Commission of violent acts Being the victim of violent acts Both of the above	19.6 5.2 7.6	9.9 3.9 3.6	KiGGS*3: 11−17 years
Sexual behavior Sexual intercourse at or before age 14 Too early sexual intercourse in own estimation No protection the first time Sexual intercourse or other sexual conduct against one’s will	14 38 15 3	12 22 9 13	BZgA*4: 14−17 years
Mental abnormalities Depression Anxiety Attention deficit hyperactivity disorder (ADHD)	5.4 10.1 2.9	5.3 10.0 1.4	BELLA*3: 7−17 years
Scholastic problems Ever at risk for repeating a grade Repeated a grade	28 20	24 14	Shell Youth Study*5: 12−21 years
Physical inactivity Physically active less than once per week 3 or more hours of television watching per day	10.1 22.1	21.5 23.6	KiGGS*6: 11−17 years KiGGS*7: 11−17 years
Nutrition Overweight Obese Markedly underweight	9.0 8.2 2.4	8.1 8.9 1.4	KIGGS*8: 14−17 years

^*1Lampert and Thamm 2007 (e9);

^*2Ravens-Sieberer et al. 2007 (e11);

^*3Schlack and Hölling 2007 (e10);

^*4BZgA 2006 (e12);

^*5Shell Deutschland Holding (e13);

^*6Lampert et al. 2007 (e14);

^*7Lampert et al. 2007 (e15);

^*8Kurth and Schaffrath Rosario 2007 (e16). KiGGS, German Health Interview and Examination Survey for Children and Adolescents; BELLA, BELLA Study (mental health module within KiGGS), BZgA, German Federal Centre for Health Education. From (39) Bühler A: Risikoverhalten in der Jugend. In: Uhlhaas PJ. Konrad K (eds): Strukturelle Hirnentwicklung in der Adoleszenz. Stuttgart: Kohlhammer 2011; 189–205. Reprinted with the kind permission of Kohlhammer, Stuttgart