Table 2. Distribution of exposures, outcome and covariates during the COVID-19 interventions and during normal times.  | 
   
  
    
| Variable | 
Normal times Mean (SD, 95% CI) | 
during the COVID-19 interventions Mean (SD, 95% CI) | 
 
| Media use in hours/day | 
Smartphone | 
2.48 (±1.21; 2.40-2.56) | 
3.00 (±1.31; 2.92-3.09) | 
 
 | 
TV | 
0.83 (±0.95; 0.77-0.89) | 
1.10 (±1.21; 1.02-1.18) | 
 
 | 
PC/computer/tablet | 
2.04 (±1.39; 1.95-2.14) | 
2.94 (±1.61; 2.83-3.05) | 
 
 | 
Gaming console | 
0.19 (±0.53; 0.15-0.22) | 
0.31 (±0.83; 0.25-0.36) | 
 
 | 
Total media use | 
5.54 (±2.29; 5.39-5.69) | 
7.35 (±2.78; 7.17-7.53) | 
 
 | 
Total social media use | 
2.74 (±1.69; 2.63-2.85) | 
3.77 (±2.33; 3.62-3.93) | 
 
| Physical activity ≥30 min. in days/week | 
3.76 (±1.89; 3.64-3.89) | 
3.65 (±2.05; 3.52-3.79) | 
 
 | 
N (%) | 
N (%) | 
 
| PA recommendations* | 
Complied | 
331 (37.44) | 
325 (36.76) | 
 
 | 
Not complied | 
553 (62.56) | 
559 (63.24) | 
 
| Main occupation | 
College/university | 
770 (87.10) | 
598 (67.65) | 
 
 | 
Vocational training/ school/traineeship | 
40 (4.52) | 
25 (2.83) | 
 
 | 
Employed | 
36 (4.07) | 
36 (4.07) | 
 
 | 
Unemployed | 
2 (0.23) | 
18 (2.04) | 
 
 | 
Be on/work short-time | 
- | 
10 (1.13) | 
 
 | 
Else | 
36 (4.07) | 
197 (22.29) | 
 
| Working hours in main occupation in hours | 
0 | 
5 (0.57) | 
18 (2.04) | 
 
 | 
1 - <20 | 
133 (15.05) | 
219 (24.77) | 
 
 | 
20 - <30 | 
225 (25.45) | 
145 (16.40) | 
 
 | 
30 - <40 | 
362 (40.95) | 
241 (27.26) | 
 
 | 
≥40 | 
159 (17.99) | 
261 (29.52) | 
 
| Physical exertion at main occupation | 
 
 | 
Not working | 
5 (0.57) | 
18 (2.04) | 
 
 | 
Sitting activity without physical exertion | 
329 (37.22) | 
640 (72.40) | 
 
 | 
Sitting with some physical exertion | 
384 (43.44) | 
137 (15.50) | 
 
 | 
Standing or walking activity without physical exertion | 
86 (9.73) | 
34 (3.85) | 
 
 | 
Standing or walking activity with some physical exertion | 
50 (5.66) | 
29 (3.28) | 
 
 | 
Manual, physical (very) demanding activity | 
30 (3.40) | 
25 (2.83) | 
 
 | 
Missing | 
0 | 
1 (0.11) | 
 
| Second job | 
Yes | 
327 (36.99) | 
222 (25.11) | 
 
 | 
No | 
557 (63.01) | 
662 (74.89) | 
 
| Cohabitation | 
Living alone | 
94 (10.63) | 
81 (9.16) | 
 
 | 
Living with others | 
790 (89.37) | 
803 (90.84) | 
 
| Changes in free time | 
More free time | 
/ | 
475 (53.73) | 
 
 | 
No changes | 
/ | 
175 (19.80) | 
 
 | 
Less free time | 
/ | 
234 (26.47) | 
 
| Changes in time caring for others | 
More time caring | 
/ | 
128 (14.48) | 
 
 | 
No changes | 
/ | 
288 (32.58) | 
 
 | 
Less time caring | 
/ | 
30 (3.39) | 
 
 | 
Does not apply | 
/ | 
438 (49.55) | 
 
  | 
   
 
  
    N number of observations, SD standard deviation, CI confidence interval,  | 
   
 
  
    *PA recommendations according to the WHO guidelines: 5 or more days per week of at least 30 minutes of physical activity that raised the breathing rate (WHO, 2010).  | 
   
 
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