Table 2.

Quantitative outcome measures

Variables	Measures	Time of measurement
Primary outcomes
Current pain intensity	1-item Numerical Rating Scale 0–10	Baseline, intermediate, post-treatment
Pain coping and cognition	Pain Coping and Cognitions List
Fatigue	Checklist Individual Strength
Psychopathological symptoms	Symptom Check List
Secondary outcomes
Clinically relevant improvement	Patient Global Impression of Change	Intermediate, post-treatment
General subjective health	“What do you think of your current health in general?”
Perceived functioning	“Please indicate how satisfied you are with your current level of functioning.”
Treatment satisfaction	Three Likert scale items, that is, “Would you recommend this treatment centre to other rehabilitation patients?”	Post-treatment

Patient variables are demographic, health status and treatment history information (see table 3).