Factors Influencing Job Burnout and Musculoskeletal Disorders among Coal Miners in the Xinjiang Uygur Autonomous Region

Table 5

Individual factor assignment table.

Predictor	Variable	Assignment
X1	Age	18∼29 years = 1, 30∼39 years = 2, 40∼49 years = 3, 50∼60 years = 4
X2	Length of service	1∼10 years = 1, 11∼20 years = 2, ≥21 years = 3
X3	Shift system	Day shift = 1, two shifts = 2, more than two shifts = 3
X4	Type of work	Coal miners = 1, excavate miners = 2, transport miners = 3, special miners = 4, assist miners = 5
X5	Annual income (yuan)	15000∼70000 = 1, 70000∼100000 = 2, 100000 more than = 3
X6	Burnout level
	Zero burnout
	Mild burnout
	Moderate burnout
	Severe burnout