Table 1.

Complementary outcome measures

Outcomes	Criteria	Tools
Impairments and activity limitations	Pain	Visual analog scale [32,34]
	Trunk flexibility	Finger-floor distance [31]
	Trunk muscles endurance	Time of isometric contraction of the flexor muscles of the spine: Ito-test [33]
		Time of isometric contraction of the extensors muscles of the spine: Sorensen-test [30]
	Loading capacity	PILE-test (Progressive Isoinertial Lifting Evaluation) [35,36]
	Anxiety and depression	Hospital Anxiety and Depression scale [38].
Personal beliefs and environmental conditions	Patient’s fears and beliefs for physical activity by	Fear Avoidance Beliefs Questionnaire [37]
	Evaluation of the job constrain	Work Ability Index questionnaire (WAI) [39]