Table 2.

Overview of the information collected at baseline, during the weekly tailoring sessions, and at follow-ups at 6 weeks and 3, 6, and 9 months.

Characteristics		Baseline	Weekly tailoring	Follow-ups
Descriptive variables
	Participant characteristics	x
	Sociodemographics	x
Primary outcome
	Roland-Morris Disability Questionnaire [29,32]	x		x
Secondary and exploratory outcomes
	Average pain intensity past week	x	x	x
	Worst pain intensity past week	x		x
	Duration of current episode with low back pain	x		x
	Pain medication frequency past week	x		x
	Fear-Avoidance Belief Questionnaire [35]	x	xa	x
	Pain Self-Efficacy Questionnaire [36]	x	xb	x
	Activity limitation, work and leisure	x		x
	Work ability index (single-item) [37]	x	x	x
	Saltin-Grimby Physical Activity Level [38]	x		x
	Patient Specific Function Scale [39]	x		x
	Sleep problems [40]	x	xb	x
	Perceived Stress Scale [41]	x	xb	x
	Quality of life: EuroQoL 5-Dimension [42]	x		x
	Brief Illness Perception Questionnaire [43]	x		x
	Patient Health Questionnaire–8 [44]	x	xb	x
	Global Perceived Effect			x
	Patient Acceptable Symptom State			x
	Perceived barriers		x
	Pain-related function		xc

^aFear-avoidance assessed with single-item Tampa scale [45].

^bReduced number of items or single items.

^cFunction assessed with single items from Chronic Pain Grade Scale [46].