Table 1 Baseline characteristics (n = 2,706)

Geographical Regions, n (%)

Capital Region of Denmark

594

(22.0)

Region of Southern Denmark

735

(27.2)

Central Denmark Region

499

(18.4)

North Denmark Region

878

(32.4)

Female, n (%)

1.798

(66.4)

Age, mean (SD)

48.3

(15.1)

Unskilled

392

(14.8)

Lower level (<3 years)

596

(22.5)

Vocational and training

426

(16.1)

Medium level (3–4 years)

802

(30.3)

Higher level (>4 years)

315

(11.9)

Other

118

(4.5)

None

1.776

(65.6)

Temporary

245

(9.1)

Permanent

181

(6.7)

Retired

504

(18.6)

Private health insurance, n (%)

798

(30.1)

Compensation claim (litigation), n (%)

139

(5.2)

  < 1 month

640

(24.2)

 1–3 months

739

(27.9)

 4–12 months

505

(19.1)

  > 12 months

766

(28.9)

Pain score 0–10,mean (SD)

6.5

(2.3)

Number of pain sites 0–9, mean (SD)

2.8

(1.7)

Pain during activity score 0–100, mean (SD)

32.7

(20.6)

Disability score 0–100, mean (SD)

26.2

(20.0)

 Constant

979

(36.9)

 Daily basis

1,341

(50.6)

 2–6 times a week

212

(8.0)

 1–4 times a month

76

(2.9)

 Less often

42

(1.6)

 Several times a day

818

(30.9)

 Once a day

243

(9.2)

 2–6 times a week

518

(19.5)

 1–4 times a month

383

(14.5)

 Less often

226

(8.5)

 Never

462

(17.4)

 1

591

(22.3)

 2 or more

224

(8.5)

 Previous episode, n (%)

1.357

(50.7)

 Fear avoidance 0–30, mean (SD)

15.8

(8.4)

 Coping skills 0–10, mean (SD)

5.4

(2.8)

 Sleep score 0–100, mean (SD)

35.3

(29.0)

 Mental health score 0–100, mean (SD)

75.0

(17.6)

 Smoker, n (%)

532

(19.7)

 Body Mass Index, mean (SD)

26.1

(4.7)

 Physical activity ≥30 min.0–7 days, mean (SD)

4.1

(2.5)