Table 1.
Demographic and baseline characteristics of participants (N=9482).
| Characteristics | Values, n (%) | |
| Age (years) |
|
|
|
|
15-20 | 1883 (19.9) |
|
|
21-30 | 4612 (48.6) |
|
|
31-40 | 1342 (14.2) |
|
|
41-50 | 803 (8.5) |
|
|
>50 | 842 (8.9) |
| VDTa use per day | ||
|
|
Less than 1 hour | 278 (2.9) |
|
|
1-4 hours | 985 (10.4) |
|
|
>4-6 hours | 2432 (25.7) |
|
|
>6-8 hours | 2754 (29) |
|
|
>8 hours | 3033 (32) |
| Educational level | ||
|
|
Lower than bachelor’s degree | 1831 (19.3) |
|
|
Bachelor’s degree | 6281 (66.3) |
|
|
Higher than bachelor’s degree | 1370 (14.5) |
| Regions of participants’ residence | ||
|
|
Northern region | 727 (7.8) |
|
|
Northeastern region | 934 (10) |
|
|
Central region excluding Bangkok city | 1,975 (21.1) |
|
|
Bangkok city | 4316 (46.1) |
|
|
Eastern region | 656 (7) |
|
|
Western region | 196 (2.1) |
|
|
Southern region | 561 (6) |
aVDT: visual display terminal.