Table 1.

Overview of the information collected at the baseline.

Baseline information			Response options or questionnaire reference
Demographics			Age, gender, height, weight, family, ethnicity, education, employment status
Physical work characteristics			Saltin–Grimby Physical Activity Scale [37]
Current LBPa
	Average last week	Visual analog scale, 0-10 [38]
	Worst last week	Visual analog scale, 0-10 [38]
History of LBP
	Length of current episode	<1 week; 1-4 weeks; 5-12 weeks; >12 weeks
	Days with LBP past year	0 days; 1-7 days; 8-30 days; >30 but not every day; every day
Use of pain medication last week (days)			None; 1-2 days; 3-5 days, daily
Pain-related disability			Roland-Morris Disability Questionnaire [39]
Function			Patient Specific Functional Scale [40]
Activity limitation
	Reduced work activity	Yes; no
	Reduced leisure time activity	Yes; no
Current work ability			Work ability index, 0-10 (single item) [41]
Leisure time physical activity			Saltin–Grimby Physical Activity Scale [37]
Comorbidities, musculoskeletal			Pain mannequin
Comorbidities, others			Cardiovascular disease; heart failure; stroke or brain hemorrhage; asthma; chronic bronchitis or emphysema, COPDb; diabetes; gastrointestinal problems; kidney disease; cancer; epilepsy; osteoporosis; osteoarthritis; depression; anxiety; sleep apnea; rheumatoid arthritis; psoriatic arthritis or psoriasis; other
Quality of life			EQ-5Dc [42]
Sleep problems			Sleep Screening Questionnaire [43]
Fear-avoidance beliefs			Fear-Avoidance Beliefs Questionnaire [44]
Pain self-efficacy			Pain-Related Self-Efficacy Questionnaire [45]
Illness perception			Brief Illness Perception Questionnaire [46]
Perceived stress			Perceived Stress Scale [47]
Mood			Patient Health Questionnaire [48]

^aLBP: low back pain.

^bCOPD: chronic obstructive pulmonary disease.

^cEQ-5D: European Quality of Life-5 Dimensions.