Table 2.
Environmental and ergonomic characteristics and percentage of VDT workers with altered variables (n = 109).
| Variables | Mean | SD |
| Viewing distance (cm) | 67.6 | 8.9 |
| Eye to screen angle α (°) | 26.8 | 5.7 |
| Vision angle α′ (°) | 21.1 | 5.2 |
| Screen tilt angle β (°) | 96.4 | 6.1 |
| Air temperature (°C) | 22.7 | 1.7 |
| Relative humidity (%) | 41.5 | 5.6 |
| Illumination (lux) | 489.6 | 297.4 |
| Altered variables | n | % |
| Viewing distance | 18 | 16.5 |
| Eye to screen angle α | 0 | 0.0 |
| Vision angle α′ | 0 | 0.0 |
| Air temperature | 19 | 17.4 |
| Relative humidity | 81 | 74.3 |
| Illumination | 77 | 70.6 |
| VDT adjustment | 48 | 44.0 |
| Neck posture | 34 | 31.2 |
Abbreviation: VDT: video display terminal.