| Project | Variable | % | Project | Variable | % |
| Questionnaire | Father | 13.2 | Work form | Day shift | 69.8 |
| Mother | 86.8 | Night shift | 0.4 | ||
| Age | 20 - 30 | 28.8 | Not working or part-time | 22.9 | |
| 31 - 40 | 67.1 | Uncertain | 6.9 | ||
| 40+ | 4.1 | Monthly household income | 6000- | 22.6 | |
| Education level | Specialist and below | 51.8 | 6000 - 12,000 | 33.4 | |
| Undergraduate | 38.5 | 12,001 - 20,000 | 26.8 | ||
| Master degree and above | 9.9 | 20,000+ | 17.2 |