Table 1.

Sample characteristics

Characteristic		%
Gender of child	Male	49.1
	Female	50.9
Gender of parent informant	Male	15.2
	Female	84.8
Ethnic origin of biological mother	Norwegian	93.0
	Western Countries	2.7
	Other countries	4.3
Ethnic origin of biological father	Norwegian	91.0
	Western Countries	5.8
	Other countries	3.2
Biological parents’ marital status	Married	56.3
	Cohabiting > 6 months	32.6
	Separated	1.7
	Divorced	6.8
	Widowed	.2
	Cohabiting < 6 months	1.1
	Never lived together	1.3
Informant parent’s socio-economic status	Leader	5.7
	Professional, higher level	25.7
	Professional, lower level	39.0
	Formally skilled worker	26.0
	Farmer/fisherman	.5
	Unskilled worker	3.1
Parent’s highest completed education	Not completed junior high school	0
	Junior high school (10th grade)	.6
	Some educ. after jun. high school	6.1
	Senior high school (13th grade)	17.3
	Some educ. after sen. high school	3.4
	Some college or university educ.	7.6
	Bachelor degree	6.2
	College degree (3–4 years study)	33.6
	Master’s degree or similar	20.3
	Ph.D. completed or ongoing	4.4
Households’ gross annual income	0 - 40,000 USD	3.3
	40,000 - 94,000 USD	18.4
	94,000 - 161,000 USD	51.6
	161,000 USD +	26.7
At least one parent had received treatment for mental health problems	None	73.8
	Outpatient only	16.3
	Hospitalized	10.0
Parents had received medical treatment for mental health problems	No	87.4
	Yes	12.6