Pre-sleep screen time and screen time addiction as shared determinants of poor sleep and obesity in adolescents aged 11–14 years in Scotland

Table 4 Adolescent screen time by adiposity status

Screen time variable		UF/HF				OF/OB				Total
Screen time variable		N	%	Mean	SD	N	%	Mean	SD	N	Mean	SD
Timing of screen time
First 30 min of the day (WD)	None	19	30.6			1	1.6			20
	1–2 days a week	12	19.4			1	1.6			13
	3–4 days a week	6	9.7			2	3.2			8
	5 days a week	3	4.8			18	29.0			21
Last 30 min of the day (WD)	None	19	30.6			0	0.0			19
	1–2 days a week	11	17.7			1	1.6			12
	3–4 days a week	8	12.9			4	6.5			12
	5 days a week	2	3.2			17	27.4			19
First 30 min of the day (WE)	None	17	27.4			0	0.0			17
	1 day	17	27.4			3	4.8			20
	Both days	6	9.7			19	30.6			25
Last 30 min of the day (WD)	None	17	27.4			0	0.0			17
	1 day	21	33.9			5	8.1			26
	Both days	2	3.2			17	27.4			19
Screen time addiction
Videogaming		40		9.30	4.69	22		25.55	7.28	62	15.06	9.68
Social media		40		11.27	8.03	22		28.09	8.21	62	17.24	11.41
Mobile phone		40		23.63	11.31	22		46.45	8.66	62	31.73	15.13
Quantity of screen time
Quantity of screen time	WD	40		7.45	4.27	22		14.95	2.87	62	10.11	5.26
	WE	40		9.17	4.70	22		17.27	2.71	62	12.05	5.65
	Var	40		1.80	1.90	22		2.32	1.29	62	1.98	1.71
Location of screen time
Use of phone in bed	Yes	19	30.6			22	35.5			41
Use of phone in bed	No	21	33.9			0	0.0			22
Phone in the bedroom overnight	Yes	21	33.9			22	35.5			43
Phone in the bedroom overnight	No	19	30.6			0	0.0			19
Phone as an alarm	Yes	11	17.7			22	35.5			33
Phone as an alarm	No	29	46.8			0	0.0			29

Key: HF healthy-fat, N number, OB obese, OF over-fat, min minutes, SD standard deviation, WD weekday, WE weekend, var variability

ISSN: 2731-913X