		Low back pain history		Statistical tests
		Yes	No	Statistical tests
Relationship with hierarchical superiors	Good	63	7	X² = 10.96; p = 0.0009
Relationship with hierarchical superiors	Bas	20	12	X² = 10.96; p = 0.0009
Relationship with colleagues	Good	76	15	P = 0.97 (Fischer)
Relationship with colleagues	Bas	7	4	P = 0.97 (Fischer)
Relationship with neighbors	Good	65	18	P = 0.08 (Fischer)
Relationship with neighbors	Bas	18	1	P = 0.08 (Fischer)
Overflow to work	Yes	61	5	X² = 15.07; p = 0.0002
Overflow to work	No	22	14	X² = 15.07; p = 0.0002
Family difficulties	Yes	33	8	X² = 0.04; p = 0.85
Family difficulties	No	50	11	X² = 0.04; p = 0.85
Stress to work	Yes	60	11	X² = 1.51; p = 0.22
Stress to work	No	23	8	X² = 1.51; p = 0.22