TABLE 1.

Participant’s characteristics (n = 845). Longitudinal Study of the Lifestyle of Adolescents, Brazil, 2019.

Variables	Statistics
Sex, n (%)
Male	420 (49.7)
Female	425 (50.3)
Age (years), mean ± SD	16.4 ± 1.1
Socioeconomic status (0–100), mean ± SD	39.3 ± 9.9
Screen use for studying (hours), n mean ± SD	2.2 ± 2.3
Screen use for studying, n (%)
˂2 h	508 (60.1)
2 to ˂4 h	211 (25.0)
≥4 h	126 (14.9)
Screen use for working (hours), n mean ± SD	0.8 ± 2.2
Screen use for working, n (%)
˂2 h	707 (83.7)
2 to ˂4 h	99 (11.7)
≥4 h	39 (4.6)
Screen use for videos (hours), n mean ± SD	3.1 ± 2.8
Screen use for videos, n (%)
˂2 h	313 (37.0)
2 to ˂4 h	322 (38.1)
≥4 h	210 (24.9)
Screen use for gaming (hours), n mean ± SD	2.0 ± 3.2
Screen use for gaming, n (%)
˂2 h	576 (68.2)
2 to ˂4 h	142 (16.8)
≥4 h	127 (15.0)
Screen use for social media (hours), n mean ± SD	4.2 ± 4.3
Screen use for social media, n (%)
˂2 h	286 (33.8)
2 to ˂4 h	248 (29.3)
≥4 h	311 (36.8)
Tobacco use in the past 30 days, n (%)
0 days	775 (91.7)
1–5 days	42 (5.0)
6 or more	28 (3.3)
Alcohol use in the past 30 days, n (%)
0 days	477 (56.4)
1–5 days	269 (31.8)
6 or more	99 (11.7)

SD, Standard Deviation.