Table 2.
Most definitive model after the hierarchical logistic regression analyses (n = 1824) using sociodemographics, clinical characteristics, experience, and mental health characteristics explaining satisfaction with treatment results
| Variables | Range (when applicable) | Nonstandardized OR (95% CI) | Standardized OR (95% CI) | p value |
| Age in years | 0.99 (0.98-1.01) | 0.92 (0.79-1.07) | 0.27 | |
| Sex (male) | 1.22 (0.95-1.59) | 1.22 (0.95-1.59) | 0.13 | |
| BMI | 0.98 (0.96-1.00) | 0.91 (0.81-1.02) | 0.11 | |
| Dominant side treated (yes) | 0.87 (0.69-1.10) | 0.87 (0.69-1.10) | 0.24 | |
| Workload (reference = unemployed) | ||||
| Light | 1.04 (0.76-1.42) | 1.04 (0.76-1.42) | 0.81 | |
| Medium | 1.07 (0.77-1.48) | 1.07 (0.77-1.48) | 0.70 | |
| Heavy | 0.79 (0.50-1.24) | 0.79 (0.50-1.24) | 0.30 | |
| Symptom duration in months | 1.00 (1.00-1.00) | 1.03 (0.91-1.16) | 0.66 | |
| Second opinion (no) | 1.02 (0.48-2.18) | 1.02 (0.48-2.18) | 0.96 | |
| Recurrence (yes) | 0.95 (0.63-1.45) | 0.95 (0.63-1.45) | 0.81 | |
| Smoking (no) | 0.94 (0.67-1.32) | 0.94 (0.67-1.32) | 0.73 | |
| EQ-5D VAS self-rated health | 0-100 | 1.01 (1.00-1.01) | 1.13 (1.00-1.28) | 0.05 |
| Change in VAS pain during load | 0-100 | 1.03 (1.02-1.03) | 2.52 (2.18-2.92) | < 0.001 |
| Change in VAS function | 0-100 | 1.02 (1.01-1.02) | 1.76 (1.54-2.01) | < 0.001 |
| PREM shared decision-making positive (yes) | 1.04 (0.80-1.36) | 1.04 (0.80-1.36) | 0.77 | |
| PREM pros/cons positive (yes) | 1.83 (1.41-2.38) | 1.83 (1.41-2.38) | < 0.001 | |
| PREM advice positive (yes) | 1.57 (1.21-2.04) | 1.57 (1.21-2.04) | < 0.001 | |
| B-IPQ consequences | 0-10 | 0.95 (0.89-1.01) | 0.88 (0.75-1.04) | 0.12 |
| B-IPQ timeline | 0-10 | 1.06 (1.01-1.12) | 1.20 (1.04-1.37) | 0.01 |
| B-IPQ personal control | 0-10 | 1.09 (1.04-1.14) | 1.24 (1.10-1.40) | < 0.001 |
| B-IPQ identity | 0-10 | 0.93 (0.88-0.99) | 0.84 (0.72-0.97) | 0.02 |
| B-IPQ concern | 0-10 | 0.94 (0.89-1.00) | 0.84 (0.72-0.99) | 0.04 |
| B-IPQ coherence | 0-10 | 0.98 (0.92-1.04) | 0.95 (0.84-1.08) | 0.43 |
| B-IPQ emotional response | 0-10 | 1.00 (0.95-1.06) | 1.01 (0.86-1.18) | 0.94 |
| CEQ credibility score | 3-27 | 1.03 (0.98-1.08) | 1.11 (0.95-1.30) | 0.19 |
| CEQ expectancy score | 3-27 | 1.05 (1.01-1.09) | 1.23 (1.04-1.46) | 0.02 |
| PCS total score | 0-52 | 0.99 (0.97-1.00) | 0.90 (0.78-1.04) | 0.17 |
| PHQ-4 total score | 0-12 | 1.01 (0.95-1.08) | 1.03 (0.89-1.18) | 0.70 |
Nonstandardized and standardized odds ratios, 95% CIs, and p values are displayed, along with the AUC and the Nagelkerke r2 for the model; the nonstandardized ORs in our most definitive model indicate that with every unit increase in either a continuous, dichotomous, or categorical independent variable, the odds of being satisfied with the treatment results increase or decrease by the value of the nonstandardized OR; standardized ORs are converted to the same scale, which makes it easier to make between-variable comparisons and determine the relative association of each explanatory variable. Interpretation AUC (ability of the model to discriminate between more satisfied and less satisfied patients) = 0.82; interpretation Nagelkerke r2 (goodness of fit of the model) = 0.39; EQ-5D = EuroQol-5 Dimensions; PREM = patient-reported experience measure; B-IPQ = Brief Illness Perception Questionnaire; CEQ = Credibility/Expectancy Questionnaire; PCS = Pain Catastrophizing Scale; PHQ = Patient Health Questionnaire; OR = odds ratio.