1. Nationality
2. Sex	a. Male b. Female
3. Age	a. 20s b. 30s c. 40s d. > 50
4. How long have you been working in the construction industry?	a. less than 1 year b. 1–10 years c. 10–20 years d. 20–30 years e. > 30 years
5. Education level	a. Middle school or lower b. High school c. University d. Graduate school
6. Duty
7. The city you work in
8. How long have you been living in the Republic of Korea?	a. < 1 year b. 1–2 years c. 2–5 years d. 5–10 years e. > 10 years
9. Did you have safety education?	a. Yes b. No
10. Have you ever had an accident in a construction site?	a. Yes b. No
11. Korean language ability	a. not at all b. poor c. intermediate d. good e. very good