Table 2.

SDQ scores in Norwegian adolescents by gender in the two surveys from 2002 and 2017.

	SDQ variable	N	Mean (SD)	Rangea
2002
Male	Total difficulties	827	8.9 (4.6)	0–28
	Conduct problems	828	2.1 (1.6)	0–10
	Hyperactivity	827	3.6 (2.0)	0–10
	Peer problems	827	1.7 (1.6)	0–8
	Emotional symptoms	828	1.5 (1.7)	0–9
	Prosocial behavior	828	6.8 (1.9)	1–10
	Impact score	822	0.3 (0.9)	0–7
Female	Total difficulties	809	10.3 (5.1)	0–34
	Conduct problems	809	1.9 (1.4)	0–9
	Hyperactivity	809	3.7 (2.0)	0–10
	Peer problems	809	1.4 (1.4)	0–10
	Emotional symptoms	809	3.2 (2.4)	0–10
	Prosocial behavior	809	7.9 (1.6)	0–10
	Impact score	804	0.5 (1.2)	0–10
2017
Male	Total difficulties	743	9.7 (5.2)	0–33
	Conduct problems	743	1.8 (1.6)	0–8
	Hyperactivity	743	4.0 (2.1)	0–10
	Peer problems	743	1.8 (1.7)	0–9
	Emotional symptoms	743	2.1 (1.9)	0–10
	Prosocial behavior	742	7.2 (1.9)	0–10
	Impact score	741	0.3 (1.0)	0–8
Female	Total difficulties	809	11.1 (5.5)	0–36
	Conduct problems	809	1.4 (1.4)	0–9
	Hyperactivity	809	3.7 (2.1)	0–10
	Peer problems	809	1.8 (1.7)	0–9
	Emotional symptoms	809	4.2 (2.6)	0–10
	Prosocial behavior	809	8.0 (1.7)	1–10
	Impact score	806	0.9 (1.7)	0–9

^aRange refers to the minimum and maximum scores in our study sample.

SDQ, Strengths and Difficulties Questionnaire.