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Table 2 Overview of variables measured in this study

From: Effectiveness of behavioural graded activity compared with physiotherapy treatment in chronic neck pain: design of a randomised clinical trial [ISRCTN88733332]

Variable Time Measured Range of unit
  T0 T4 T9 Ts T26 T52  
Inclusion and exclusion variables x       
Demographic variables x       
Baseline variables        
Specific complaint characteristics x       
Experience of the neck complaint and functioning in daily activities x       1–7 (Likert scale)
Co-morbidity x       
Additional complaints x       
Primary outcome        
'Global perceived effect' (neck complaint and functioning in daily activities) [31]   x x x x x 1–7 (Likert scale)
Secondary outcomes        
Main complaint [29] x x x x x x 0–10 (Likert scale)
Pain (VAS) [31] x x x x x x  
Medical consumption x x x x x x Dose per day
Coping with Multi-dimensional pain (MPI) Part I-II [32] x   x   x x 0–6 (Likert scale)
Activity (MPI, part III) x x x x x x 0–6 (likert scale)
Specific functional status (NDI) [33] x x x x x x  
Quality of life (SF-36) [34, 35] x   x   x x  
(EQ-5d) [35, 36] x x x x x x  
Work activities x   x   x x Hours/week
Satisfaction about treatment   x x x x   1–5 (Likert scale)
Compliance with treatment exercise   x x x x x Number and time per week
Additional treatments   x x x x x Discipline and number of treatments
Side-effects   x x x x x Yes – No and any additional elucidation
Psychological (prognostic) variables        
Fear of movement (TSK) [37] x     x x 1–4 (likert scale)
Catastrophizing (PCS) [38] x   x   x   1–5 (likert scale)
Depression (CES-D) [39] x   x   x   1–4 (likert scale)
Self-efficacy (PSEQ) [40] x x x x x x 10–100% (very unsure – very sure)
Stages of change (PSOCQ) [41] x   x     1–5 (likert scale)
  1. Note: T0 = baseline measurement, T4, T9, (TS), T26, T52 are follow-up measurements at 4, 9, 26 and 52 weeks, respectively, after randomisation. Ts was received at the end of treatment, when treatment lasted longer than 9 weeks. MPI, Multidimensional Pain inventory; NDI, Neck Disability Index; SF-36, Short Form 36; EQ-5d, Euroquol 5-Dutch language version; TSK, Tampa Scale for Kinesiophobia; PCS, Pain Catastrophizing Scale; CES-D, Centre for Epidemiologic Studies – Depression; PSEQ, Pain Self-Efficacy Scale; PSOCQ, Pain Stages Of Change Questionnaire.