Table 2 Outcomes, additional variables and follow-ups

Outcome variables

 Primary

Characteristic pain intensity

X

X

X

X

X

Disability score

X

X

X

X

X

Patient-related satisfaction

X

X

X

X

 Secondary

Psychological distress

X

X

X

X

X

Health-related quality of life

X

X

X

X

X

Catastrophizing

X

X

X

X

X

Number of sick leave days^b

Sickness allowance^b

Treatment costs^b

Additional variables

 Control

Therapy expectation

X

 Process

Physical activity

X

X

X

X

X

Flexible self-regulation

X

X

X

X

X

Health literacy

X

X

X

X

X