Table 2 Univariate analysis of the contribution of baseline variables to three types of patient-reported outcomes; the diseases-specific RMDQ, the generic EQ-5D scores and the individualized PGI at 12 months

 Sex (women = 2)

.004

-.506

.433

.000

-.005

.912

.005

3.222

.421

 Age years

.000

-.002

.940

.000

-.001

.791

.000

.004

.982

 Ethnicity (Norwegian) (yes/no) (no = 2)

.040

2.118

.016

.023

-.105

.066

.009

−6.148

.264

 Education level (>12 years = 2)

.046

−1.863

.009

.049

.126

.006

.015

6.453

.148

 Employment status (employed/ unemployed) (unemployed =2)

.017

1.023

.115

.021

-.073

.079

.006

3.724

.356

 Smoking (yes/no) (yes = 2)

.020

1.780

.088

.014

-.098

.145

.004

−4.476

.491

 BMI

.017

.121

.116

.009

-.006

.250

.016

-.696

.143

 Previous LBP (yes/no) (yes = 2)

.005

.764

.401

.002

-.035

.554

.000

-.224

.968

 Back pain (NRS) (0–10)

.042

.382

.013

.034

-.022

.024

.023

−1.711

.076

 Co-morbidity (yes/no) (yes = 2)

.000

.136

.833

.000

-.004

.928

.007

−3.789

.344

 Clinical setting (Medical Doctor/ Physio) (MD = 2)

.085

2.402

.000

.053

-.123

.005

.014

−5.915

.162

 Treatment (usual care/cognitive) (usual care = 2)

.008

-.697

.274

.002

.024

.552

.002

1.878

.635

 Brief-IPQ^b (0–100)

.146

.118

.000

.185

-.009

.000

.068

-.483

.002

 HSCL-25^c (1–4)

.055

2.065

.004

.062

-.143

.002

.025

−8.419

.063

 PCS^d (0–52)

.148

.162

.000

.097

-.009

.000

.033

-.456

.034

 RMDQ^e baseline (0–24)

.097

.301

.000

.060

-.015

.003

.004

-.386

.437

 EQ-5D^f baseline (−0.59-1)

.097

−4.536

.000

.082

.272

.000

.021

12.589

.092

 PGI^g baseline (0–100)

.013

-.030

.182

.006

.001

.391

.007

.134

.336