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Table 1 Outcome measures and timing of data collection

From: Rationale, design and methods of the Study of Work and Pain (SWAP): a cluster randomised controlled trial testing the addition of a vocational advice service to best current primary care for patients with musculoskeletal pain (ISRCTN 52269669)

Measures Description  
   Baseline 4 months 12 months
Primary outcome measures    
Absence Work absence self-reported and GP certified including duration of absence, and struggling at work
Secondary outcome measures    
Pain intensity Three questions: 0–10 scales for ‘present’, ‘usual’ and ‘least’ pain in last 2 weeks
Bothersomeness Single question: 1–5 point scale
Change Global Assessment of Change – one question
Return to work self-efficacy Self-Efficacy Return to Work Questionnaire
Work performance Stanford presenteeism scale 6 (SPS6), plus single question on performance at work
Prognostic indicators or potential mediators    
Demographics Gender, date of birth, socio-economic status (recent paid job title)
Employment Current work situation
Episode duration One question on duration of current episode, plus one question on time since pain-free month
Pain elsewhere Additional pain locations indicated on a Body Manikin
Illness perceptions Musculoskeletal Illness Perceptions Questionnaire Revised (IPQ-R) Short-Form
Symptoms of anxiety and depression Hospital Anxiety and Depression Questionnaire (HADs)
Pain self- efficacy Pain Self Efficacy Questionnaire (PSEQ)
Attitudes & beliefs (patients) re. work & health Newly developed questionnaire
Content of GP/NP consultation Questions regarding topics covered by the GP/NP (including work)
Treatment satisfaction Question regarding satisfaction with treatment
Health economic measures    
Health care utilisation Health Care Utilisation Questions