| Variable | Category | Sleeping Time | Total | |
| After 1:00 am (late) | Before 1:00 am (early) | |||
| Current cigarette smoking |
| |||
|
| Yes | 24 | 12 | 36 |
| No | 146 | 84 | 230 | |
| Total | 170 | 96 | 266 | |
| Using stimulus (coffee, tea, power drinks) |
| |||
|
| Yes | 99 | 55 | 154 |
| No | 71 | 41 | 112 | |
| Total | 170 | 96 | 266 | |
| Frequency of temporary sicknesses |
| |||
|
| None | 56 | 24 | 80 |
| Once/month | 75 | 52 | 127 | |
| Twice/month | 22 | 5 | 27 | |
| More | 11 | 5 | 17 | |
| Total | 164 | 86 | 251 | |
| Chronic illnesses |
| |||
|
| Diabetes miletus | 13 | 7 | 20 |
| Hypertension | 13 | 5 | 18 | |
| Rheumatoid | 15 | 2 | 17 | |
| Allergies | 9 | 3 | 12 | |
| Tumors | 4 | 1 | 5 | |
| Others | 28 | 8 | 36 | |
| Total | 82 | 26 | 108 | |