TABLE 1.

Demographic characteristics of the sample.

	n	%	Range	% missing
Gender
Female	4243	51.6
Age [m(SD)]	16.94	0.84	16–19	0.1
Parental education
Maternal education				1.45
Primary school	652	7.9
Secondary school	2576	31.3
College/university	2905	35.3
Don’t know	1970	24.0
Paternal education				1.68
Primary school	674	8.2
Secondary school	2843	34.6
College/university	2498	30.4
Don’t know	2069	25.1
Perceived economic well-being				2.69
Better than others	2029	24.7
Equal to others	5399	65.7
Poorer than others	573	7.0
Symptoms of mental health problems
Depression [m(SD)]	5.77	5.75	0–26	4.09
ADHD [m(SD)]	26.77	10.58	0–72	4.65
Conduct problems [m(SD)]	0.40	1.01	0–8	8.06

m, mean; SD, standard deviation.