Table 1.

Background characteristics

	Total, n 15 913 (%)
Sex
Male	9220 (57⋅9)
Female	6180 (38⋅8)
Missing	513 (3⋅2)
Class
8th grade	2709 (17⋅0)
9th grade	3260 (20⋅5)
10th grade	3573 (22⋅5)
11th grade	2582 (16⋅2)
12th grade	2135 (13⋅4)
13th grade	1429 (8⋅9)
Missing	225 (1⋅4)
Perceived family economy
Good	5652 (35⋅5)
Mostly good	5545 (34⋅5)
Neither good or bad	3321 (20⋅9)
Mostly bad	875 (5⋅5)
Bad	265 (1⋅7)
Missing	255 (1⋅6)
Centrality
Least central	1872 (11⋅8)
Less central	433 (2⋅7)
A bit central	2606 (16⋅4)
Very central	11 002 (69⋅1)
Leisure screen time
Less than 2 h	2549 (16⋅0)
2–3 h	3390 (21⋅3)
3–4 h	4058 (25⋅5)
4–6 h	3212 (20⋅2)
More than 6 h	2561 (16⋅1)
Missing	143 (0⋅9)
Physical activity
Never	311 (2⋅0)
Seldom to 2 times a week	2278 (14⋅3)
2–5 times a week	13 124 (82⋅5)
Missing	200 (1⋅3)