TABLE 3.
Linear regression modelling predicting pain scores before surgery for hip and knee osteoarthritis patients
|
SF-36 BP |
WOMAC |
MPQ-SF |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| B | SE B | β | B | SE B | β | B | SE B | β | |
| Age | 0.1 | 0.2 | 0.06 | −0.07 | 0.03 | −0.2* | −0.1 | 0.06 | −0.1* |
| Sex | −2.7 | 3.1 | −0.07 | 1.2 | 0.6 | 0.1 | 1.3 | 1.3 | 0.07 |
| BMI | −0.4 | 0.2 | −0.2* | 0.03 | 0.04 | 0.005 | 0.006 | 0.09 | 0.004 |
| Comorbidity | −0.7 | 0.9 | −0.06 | 0.3 | 0.2 | 0.13 | 0.9 | 0.4 | 0.2* |
| Proc | −5.1 | 3.2 | −0.1 | 0.2 | 0.7 | 0.02 | −1.9 | 1.4 | −0.1 |
| PCS | −0.4 | 0.1 | −0.3* | 0.1 | 0.03 | 0.4** | 0.4 | 0.06 | 0.5** |
| HADS-A | 0.05 | 0.5 | 0.01 | −0.03 | 0.1 | −0.04 | −0.01 | 0.2 | −0.006 |
| HADS-D | −1.0 | 0.6 | −0.2 | 0.1 | 0.1 | 0.1 | 0.4 | 0.2 | 0.1 |
| Model R2 | 0.26 | 0.33 | 0.46 | ||||||
| F value | 5.1** | 6.8** | 15.5** | ||||||
No evidence of collinearity was found between predictors.
*
P<0.05;
**
P<0.01. β Standardized beta coefficients; B Unstandardized beta coefficients; BMI Body mass index; HADS-A Hospital Anxiety and Depression Scale anxiety subscale; HADS-D Hospital Anxiety and Depression Scale depression subscale; MPQ-SF Short-Form McGill Pain Questionnaire; PCS Pain Catastrophizing Scale; Proc Procedure (hip versus knee); SE Standard error; SF-36 BP Medical Outcomes Study Short-Form 36 Bodily Pain scale; WOMAC Western Ontario and McMaster Universities Osteoarthritis Index pain scale