Table 2.
Overview of variables measured in this study
| 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) | ||||
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.