Bivariate correlation matrix
| Variables | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
| RMDQ | 0.646** | 0.537** | 0.608** | 0.570** | 0.300** | −0.108 | −0.037 | 0.554** | 0.302** | 0.614** | 0.272** | 0.410** | 0.333** | 0.441** | 0.124 | −0.145* | 0.559** | 0.560** |
| BPS | – | 0.343** | 0.417** | 0.345** | 0.328** | −0.216** | −0.043 | 0.369** | 0.150* | 0.302** | 0.071 | 0.297** | 0.303** | 0.297** | 0.283** | −0.058 | 0.537** | 0.426** |
| WHODAS | – | – | 0.556** | 0.713** | 0.504** | 0.169* | 0.126 | 0.391** | 0.459** | 0.589** | 0.371** | 0.265** | 0.237** | 0.324** | −0.230** | −0.383** | 0.227** | 0.568** |
| BS-11 | – | – | – | 0.484** | 0.373** | −0.027 | −0.030 | 0.263** | 0.255** | 0.469** | 0.171* | 0.292** | 0.281** | 0.217** | 0.000 | −0.191** | 0.413** | 0.356** |
| HADS-A | – | – | – | – | 0.491** | 0.133 | 0.079 | 0.413** | 0.353** | 0.669** | 0.312** | 0.220** | 0.200** | 0.366** | −0.124 | −0.204** | 0.277** | 0.509** |
| HADS-D | – | – | – | – | – | −0.002 | 0.045 | 0.011 | 0.163* | 0.275** | 0.093 | 0.029 | 0.058 | 0.009 | −0.048 | −0.143* | 0.261** | 0.302** |
| CSQ-C | – | – | – | – | – | – | 0.576** | 0.150* | 0.224** | 0.193** | 0.262** | 0.132 | 0.128 | 0.115 | 0.026 | −0.170* | −0.343** | 0.193** |
| CSQ-D | – | – | – | – | – | – | – | 0.133 | 0.211** | 0.123 | 0.143* | 0.041 | 0.123 | 0.101 | 0.004 | −0.120* | −0.007 | 0.208** |
| CSQ-DA | – | – | – | – | – | – | – | – | 0.695** | 0.416** | 0.651** | 0.597** | 0.612** | 0.833** | 0.033 | −0.008 | 0.323** | 0.643** |
| CSQ-RPS | – | – | – | – | – | – | – | – | – | 0.363** | 0.744** | 0.447** | 0.609** | 0.718** | −0.262** | −0.158* | 0.193** | 0.552** |
| CSQ-CAT | – | – | – | – | – | – | – | – | – | – | 0.307** | 0.092 | 0.111 | 0.316** | −0.106 | −0.224** | 0.287** | 0.492** |
| CSQ-IPS | – | – | – | – | – | – | – | – | – | – | – | 0.477** | 0.627** | 0.717** | −0.160* | −0.050 | 0.004 | 0.448** |
| CSQ-PH | – | – | – | – | – | – | – | – | – | – | – | – | 0.735** | 0.570** | 0.163* | 0.067 | 0.255** | 0.475** |
| CSQ-CSS | – | – | – | – | – | – | – | – | – | – | – | – | – | 0.707** | 0.092 | 0.073 | 0.312** | 0.451** |
| CSQ-IBA | – | – | – | – | – | – | – | – | – | – | – | – | – | – | −0.007 | 0.039 | 0.309** | 0.565** |
| MSPSS | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 0.226** | 0.002** | 0.047 |
| ORFQ | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 0.022 | −0.050 |
| BIPQ | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | 0.375** |
| FABQ | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – | – |
Pearson’s correlation was used for all variables except for WHODAS, CSQ, ORFQ and FABQ.
*Significant at p<0.05 level (two-tailed).
** Significant at Bonferroni 0.0028 level (two-tailed).
BIPQ, Brief Illness Perception Questionnaire; BPS, Back Performance Scale; BS-11,11-point box scale; CSQ, Coping Strategies Questionnaire; CSQ-C, control pain; CSQ-CAT, catastrophising; CSQ-CSS, coping self-statements; CSQ-D, decrease pain; CSQ-DA, diverting attention; CSQ-IBA, increased behavioural activities; CSQ-IPS, ignoring pain sensations; CSQ-PH, praying/hoping; CSQ-RPS, reinterpreting pain sensations; FABQ, Fear Avoidance Beliefs Questionnaire; HADS, Hospital Anxiety and Depression Scale; HADS-A, Anxiety; HADS-D, Depression; MSPSS, Multidimensional Scale of Perceived Social Support; ORFQ, Occupational Risk Factor Questionnaire; RMDQ, Roland Morris Disability Questionnaire; WHODAS, WHO Disability Assessment Schedule.