Feature	Category	Frequency	Ratio (%)
Gender	Male	185	58
Gender	Female	133	42
Age	≤19	83	26.1
	20 - 39	186	58.49
	40 - 59	43	13.52
	≥60	6	1.89
Education level	Junior high school and below	98	30.8
	High School	68	21.4
	college	136	43
	Master or above	16	5
Whether the work is stable	stable	225	70.8
Whether the work is stable	Unstable	93	29.2
Length/year of residence	(0, 10]	43	13.5
	(10, 15]	91	28.6
	>15	184	57.9