Feature	Category	Number of samples	Percentage
Gender	Male	225	82.7
Gender	Female	47	17.3
Age	16 - 24	19	7
	25 - 35	118	43.4
	36 - 45	62	22.8
	≥46	73	26.8
Education level	High school and below	7	2.6
	College	59	21.7
	Undergraduate	155	57
	Master	49	18
	PhD and above	2	7
Type of work unit	Owner	26	9.6
	Construction unit	128	47.1
	Design unit	17	6.3
	Supervision unit	6	2.2
	Purchasing unit	1	0.4
	Government department	6	2.2
	Cost consulting unit	31	11.4
	Other consulting units	5	1.8
	University or research institution	16	5.9
	Project general contractor	20	7.4
	Other	16	5.9
Where you are working	Business managers	90	33.1
	Government department managers	7	2.6
	Project manager	66	24.3
	Professional technician	72	26.5
	University or research institute researchers	16	5.9
	Other	21	7.7
Participate in the number of EPC projects	0	96	35.3
	1 - 3	154	56.6
	4 - 6	10	3.7
	≥6	12	4.4
Working years	1 - 5	84	30.9
	6 - 10	38	14
	11 - 15	38	14
	≥15	112	41.2