Table 1.
Distribution of absolute and relative frequencies of electronic devices in high school adolescents by sex.
| Factors | Sex |
|||
|---|---|---|---|---|
| Male (n = 798) |
Female (n = 830) |
|||
| n | % | n | % | |
| Watch TV | ||||
| No | 123 | 15.4 | 67 | 8.1 |
| Yes | 675 | 84.6 | 763 | 91.9 |
| How many times TV/week | ||||
| Up to 2 times | 168 | 24.7 | 205 | 21.1 |
| 3 times or more | 507 | 67.2 | 558 | 63.5 |
| Number of hours of TV/day | ||||
| Up to 2 h | 383 | 48.0 | 376 | 45.3 |
| Above 3 h | 292 | 36.6 | 387 | 46.6 |
| Use of computer | ||||
| No | 105 | 13.2 | 215 | 25.9 |
| Yes | 693 | 86.8 | 615 | 74.1 |
| Type of computer | ||||
| Desktop | 344 | 43.1 | 224 | 27.0 |
| Laptop | 263 | 33.0 | 339 | 40.8 |
| Desktop and laptop | 86 | 10.8 | 52 | 6.3 |
| Height of the computer screen | ||||
| Above the midpoint | 153 | 19.2 | 114 | 13.7 |
| At the midpoint | 473 | 59.3 | 435 | 52.4 |
| Below the midpoint | 67 | 8.4 | 66 | 8.0 |
| How many times/week | ||||
| Up to 2 times | 184 | 23.1 | 295 | 35.5 |
| 3 times or more | 509 | 63.8 | 320 | 38.6 |
| How many hours/day | ||||
| Up to 2 h | 250 | 31.3 | 341 | 41.1 |
| 3 h or more | 443 | 55.5 | 274 | 33.0 |
| Use of cell phone | ||||
| No | 33 | 4.1 | 9 | 1.1 |
| Yes | 765 | 95.9 | 821 | 98.9 |
| What posture is the cell phone used | ||||
| Standing | 276 | 34.6 | 282 | 34.0 |
| Sitting | 403 | 50.5 | 441 | 53.1 |
| Lying down | 436 | 54.6 | 491 | 59.2 |
| Semi-lying | 215 | 26.9 | 344 | 41.4 |
| Daily use time | ||||
| Up to 2 h | 220 | 27.6 | 125 | 15.1 |
| 3 h or more | 545 | 68.3 | 696 | 83.9 |
| Use of tablet | ||||
| No | 656 | 82.2 | 649 | 78.2 |
| Yes | 142 | 17.8 | 181 | 21.8 |
| What posture is the tablet used | ||||
| Standing | 25 | 3.0 | 47 | 5.6 |
| Sitting | 83 | 10.4 | 102 | 12.3 |
| Lying down | 68 | 8.5 | 82 | 9.9 |
| Semi-lying | 26 | 3.3 | 56 | 6.7 |
| Daily use time | ||||
| Up to 2 h | 94 | 11.8 | 149 | 18.0 |
| 3 h or more | 48 | 6.0 | 32 | 3.9 |