Table 6 Multivariate analysis to identify independent predictors of pain interference at 3 and 12 months for patients with chronic musculoskeletal pain and comorbid depression

Sociodemographic variables

 Currently working

-0.741

-1.356 to -0.126

0.018

-0.956

-1.706 to -0.206

0.013

Brief Pain Inventory, severity

0.260

0.097 to 0.424

0.002

0.202

0.017 to 0.388

0.033

Brief Pain Inventory, interference

0.266

0.107 to 0.425

0.001

0.214

0.027 to 0.401

0.025

Duration of chronic pain ≥ 24 months

-

-

-

1.226

0.414 to 2.038

0.003

Psychiatric comorbidity

 Severity of depression: HSCL-20 score¹

0.147

-0.294 to 0.588

0.512

0.577

0.044 to 1.111

0.034

 Anxiety disorders

0.113

-0.521 to 0.746

0.727

0.432

-0.292 to 1.156

0.241

Survey of Pain Attitudes (SOPA) domains

 Control

0.142

-0.148 to 0.431

0.335

0.252

-0.087 to 0.591

0.145

 Harm

-0.063

-0.386 to 0.260

0.700

-

-

-

 Emotion

0.007

-0.257 to 0.271

0.961

-0.161

-0.473 to 0.150

0.309

 Disability

0.402

0.020 to 0.784

0.039

0.285

-0.147 to 0.718

0.195

 Medication

-

-

-

0.150

-0.149 to 0.450

0.324

 Solicitude

-0.002

-0.191 to 0.186

0.981

0.027

-0.193 to 0.248

0.806

Pain Catastrophizing Scale (PCS) global score

0.027

0.000 to 0.054

0.047

0.004

-0.028 to 0.035

0.825

Study arm (intervention)

-0.294

-0.777 to 0.190

0.233

-0.517

-1.087 to 0.053

0.075