Table 1.

Outcome measures, scale details and data collected by time-point

Outcome measure	Scale details	Measurement time-points
Demographic data on gender, marital status, ethnicity, locations of chronic pain using pain drawing, duration of chronic pain symptoms, concomitant health symptoms, highest level of education, length of time out of work, and length of time looking for work	Categorical/quasi-continuous	Baseline
EQ-5D-5L [43]	0 to 1, where higher scores indicate greater health	Baseline, six-weeks, 14-weeks, six-months
Hospital and Anxiety Depression Scale (HADS )[44]	0 to 21 on each scale, where higher scores indicate greater anxiety or depression	Baseline, six-weeks, 14-weeks, six-months
Confidence in working	11-point numerical rating scale (NRS), where higher scores indicate greater confidence	Baseline, six- weeks, 14-weeks, six-months
Work ability [45]	11-point NRS, where higher scores indicate greater perceived work ability	Baseline, six-weeks, 14-weeks, six-months
Current pain intensity [46]	11-point NRS, where higher scores indicate greater pain intensity	Baseline, six-weeks, 14-weeks, six-months
Pain intensity over past week [46]	11-point NRS, where higher scores indicate greater pain intensity	Baseline, six-weeks, 14-weeks, six-months
The Warwick-Edinburgh Mental Wellbeing Scale (WEMWBS) [47, 48]	14 to 70, where higher scores indicate greater well-being	Baseline, six-weeks, 14-weeks, six-months
PROMIS short-form questionnaire for fatigue (8a) [49]	8 to 40, where higher scores indicate greater fatigue	Baseline, six-weeks, 14-weeks, six-months
PROMIS short-form questionnaires for pain interference (8a) [50]	6 to 30, where higher scores indicate greater pain interference	Baseline, six-weeks, 14-weeks, six-months
Satisfaction with placement	A 5-item scale from ‘very dissatisfied’ to ‘very satisfied’	Six-weeks (and 14-weeks/six-months if job offer accepted)
Work Role Functioning Questionnaire (WRFQ) [27, 51]	0 to 100, where higher scores indicate better work functioning	Six-weeks (and 14-weeks/six-months if job offer accepted)
Psychosocial Aspects of Work (PAW) [52]	Job satisfaction, 7 to 35; social support, 4 to 20; mental stress, 4 to 20; where higher scores indicate greater domain perceptions	Six-weeks (and 14-weeks/six-months if job offer accepted)
RTW Self-Efficacy Scale [53, 54]	2 to 10, where higher scores indicate greater self-efficacy	Six-weeks (and 14-weeks/six-months if job offer accepted)
Pain interference	A 5-item scale from ‘not at all’ to ‘extremely’	Six-weeks (and 14-weeks/six-months if job offer accepted)
Whether work makes pain worse	A 5-item scale from ‘not at all’ to ‘extremely’	Six-weeks (and 14-weeks/six-months if job offer accepted)
Job offers	Number of job offers (from any source)	14-weeks and six-months
Details of accepted job offers	Number of job offers accepted, job title of accepted offer, start date, and work pattern	14-weeks and six-months
Adverse events, serious adverse events	Case report details	Point of occurrence
Healthcare referrals	Case report details	Point of occurrence