Table 5.

Mental health, well-being and health-behaviour measures for all participants at baseline T1 (n = 10,315)

Measure	Range	Baseline Median (IQR) or n (%)	N
Anxiety	0–5	1.00 (2.0)	6672
All the time		464 (7.0%)
Most of the time		1052 (15.8%)
More than half the time		955 (14.3%)
Less than half the time		830 (12.4%)
Some of the time		2115 (31.7%)
At no time		1256 (18.8%)
Depression	0–5	1.00 (2.0)	6662
All the time		259 (3.9%)
Most of the time		521 (7.8%)
More than half the time		654 (9.8%)
Less than half the time		673 (10.1%)
Some of the time		1624 (24.4%)
At no time		2931 (44.0%)
Life satisfaction	0–4	3.00 (1.0)	6670
Very satisfied		1028 (15.4%)
Satisfied		2875 (43.1%)
Neither satisfied nor unsatisfied		2004 (30.0%)
Not very satisfied at all		549 (8.2%)
Not at all satisfied		214 (3.2%)
Well-being	0–100	52.00 (40.0)	6607
Perceived stress	0–16	7.00 (4.0)	6554
Stress dial	1–4	2.00 (1.0)	7763
Green (healthy)		1875 (24.2%)
Yellow (coping)		3165 (40.8%)
Orange (struggling)		1903 (24.5%)
Red (critical)		820 (10.6%)
Locus of control	0–9	4.00 (3.0)	6562
‘People like me don’t have much of a chance in life’
Strongly disagree  Kind of disagree  Kind of agree  Strongly agree		2453 (37.4%) 2090 (31.9%) 1664 (25.4%) 355 (5.4%)
‘How well you get on in this world is mostly a matter of luck’
Strongly disagree  Kind of disagree  Kind of agree  Strongly agree		1223 (18.6%) 2357 (35.9%) 2493 (38.0%) 489 (7.5%)
‘Even if I do well at school, I’ll have a hard time getting the right kind of job’
Strongly disagree  Kind of disagree  Kind of agree  Strongly agree		797 (12.1%) 1899 (28.9%) 2937 (44.8%) 929 (14.2%)
Sleep (in hours)	1–5	3.00 (1.0)	6650
Less than 5		753 (11.3%)
6–7 h		2264 (34.0%)
7–8 h		2105 (31.7%)
8–9 h		1197 (18.0%)
More than 9		331 (5.0%)
Screen time (in hours)	1–3	2.00 (2.0)	6662
1–4		1763 (26.5%)
5–7		2687 (40.3%)
More than 7		2212 (33.2%)