Table 1.

Descriptive characteristics of the full sample and stratified by variables of interest.

Characteristics		Age		Sex		Parental support
	Total sample	11–14 years	15–20 years	Males	Females	Always or usually	Sometimes	Rarely or never
	N = 6,822	N = 2,880	N = 3,942	N = 2,951	N = 3,871	N = 2,745	N = 1,667	N = 2,410
Sex
Males	43.2	43.8	42.8			36.1	42.6	51.8
Females	56.8	56.2	57.2			63.9	57.4	48.2
Age
11–14-year-old	42.2			42.8	41.8	45.5	41.4	39.0
15–20-year-old	57.8			57.2	58.2	54.5	58.6	61.0
Ethnicity
White	55.5	55.0	56.0	55.0	56.5	60.0	54.4	51.3
Other	44.5	45.0	44.0	45.0	43.5	40.0	45.6	48.7
Subjective SES
Mean	6.94	7.14	6.83	6.98	6.89	7.17	7.17	6.74
(SD)	(1.68)	(1.75)	(1.62)	(1.55)	(1.80)	(1.61)	(1.61)	(1.68)
BMI Z-score
Mean	0.33	0.37	0.31	0.35	0.31	0.33	0.33	0.34
(SD)	(1.11)	(1.21)	(1.05)	(0.97)	(1.26)	(1.13)	(1.13)	(1.08)
Social media use
No use	12.5	22.0	5.6	16.0	9.9	14.0	11.6	11.5
Light to moderate use (≤2 h/day)	39.5	39.3	39.8	46.0	34.6	43.6	40.2	34.5
Heavy use (≥3 h/day)	48.0	38.7	54.6	38.0	55.5	42.4	48.2	54.0
Parental support
Always/usually	40.2	43.4	38.0	33.6	45.3	14.0	11.6	12.5
Sometimes	24.5	24.0	24.8	24.1	24.7	43.6	40.2	34.5
Rarely/never	35.3	32.6	37.2	42.3	30.0	42.4	48.2	54.0
Psychological distress
No distress	56.3	64.2	50.4	69.9	46.0	68.1	54.5	44.0
Moderate distress	23.4	19.8	26.0	19.2	27.0	20.1	27.0	24.7
Severe distress	20.3	16.0	23.6	10.9	27.0	11.8	18.5	31.3

Data are shown as percentages or mean (standard deviation).

SES, socioeconomic status; SD, standard deviation; BMI, body mass index.