| Attribute | Frequency | Percentage (%) |
| Salary increase | 111 | 43.4 |
| Prize money (or gift voucher) | 69 | 27 |
| Paid vocation | 52 | 20.3 |
| Empowerment of accident prevention activities, etc. | 21 | 8.2 |
| Other | 3 | 1.2 |