		LBP history		Statistical tests
		Yes	No	Statistical tests
BMI (kg/m²)	Less than 30	49	13	X² = 0.57; p = 0.45
BMI (kg/m²)	Greater than 30	34	6	X² = 0.57; p = 0.45
Cervical curvature	Normal	33	12	X² = 3.43; p = 0.06
Cervical curvature	Pathological	50	7	X² = 3.43; p = 0.06
Lumbar curvature	Normal	24	14	X² = 13.26; p = 0.0003
Lumbar curvature	Pathological	59	5	X² = 13.26; p = 0.0003
Muscle endurance
Low back muscles	Normal	42	16	X² = 7.12; p = 0.0076
Low back muscles	Diminished	41	3	X² = 7.12; p = 0.0076
Abdominal wall muscles	Normal	40	13	X² = 2.53; p = 0.11
Abdominal wall muscles	Diminished	43	6	X² = 2.53; p = 0.11
Muscle strength
Gluteus maximus	Normal	46	14	X² = 2.13; p = 0.14
Gluteus maximus	Diminished	37	5	X² = 2.13; p = 0.14
Iliopsoas	Normal	48	18	X² = 9.22; p = 0.0024
Iliopsoas	Diminished	35	1	X² = 9.22; p = 0.0024
Muscle flexibility
Iliopsoas	Normal	20	13	X² = 13.88; p = 0.0002
Iliopsoas	Diminished	63	6	X² = 13.88; p = 0.0002
Hamstrings muscles	Normal	38	17	X² = 11.88; p = 0.0006
Hamstrings muscles	Diminished	45	2	X² = 11.88; p = 0.0006
Tensorfacialata	Normal	37	14	X² = 5.24; p = 0.0221
Tensorfacialata	Diminished	46	5	X² = 5.24; p = 0.0221
Regular sport practice	Yes	0	12	P = 0.0000 (Fischer)
Regular sport practice	No	83	7	P = 0.0000 (Fischer)