Table 5.
Multiple linear regression analysis to find predictors of the Parkinson's Disease Summary Index (PDQ8SI), caregiver burden scale, PD-patient mutuality, and PD-partner mutuality. n = 51 dyads.
| Unstandardized coefficients | Standardized coefficients | p value | 95% CI | Tolerance/VIF | |
|---|---|---|---|---|---|
| Dependent variable = PD-patient MS Adj R2 = .316 | |||||
| Predictors | |||||
|
| |||||
| PD-partner MS | .356 | .419 | .002 | .143–.569 | .882/1.134 |
| UPDRS III | −.023 | −.205 | .113 | −.052–.006 | .852/1.174 |
| NMS | −.025 | −.176 | .169 | −.061–.011 | .866/1.155 |
| PD-partner gender ∗ | .434 | .332 | .017 | .080–.788 | .759/1.318 |
| Education∗∗ | .144 | .110 | .366 | −.173–.461 | .938/1.066 |
| PD-partner age | −.001 | −.016 | .902 | −.020–.018 | .768/1.302 |
|
| |||||
| Dependent variable = PDQ8SI Adj R2 = .497 | |||||
| Predictors | |||||
|
| |||||
| PD-patient MS | −9.655 | −.433 | .001 | −14.862–−4.449 | .752/1.330 |
| UPDRS III | .090 | .036 | .749 | −.475–.655 | .814/1.228 |
| NMS | 1.592 | .498 | <.001 | .871–2.313 | .803/1.245 |
| IQCODE | .034 | .032 | .762 | −.190–.257 | .911/1.097 |
| PD-partner gender∗ | −4.329 | −.148 | .234 | −11.565–2.907 | .666/1.500 |
| Education∗∗ | −3.353 | −.115 | .275 | −9.471–2.766 | .924/1.083 |
| PD-partner age | −.190 | −.121 | .293 | −.551–.171 | .778/1.285 |
|
| |||||
| Dependent variable = PD-partner MS Adj R2 = .289 | |||||
| Predictors | |||||
|
| |||||
| PD-patient MS | .542 | .461 | .002 | .216–.869 | .752/1.330 |
| UPDRS III | −.013 | −.101 | .450 | −.049–.022 | .814/1.228 |
| NMS | .011 | .066 | .621 | −.034–.056 | .803/1.245 |
| IQCODE | −.017 | −.314 | .016 | −.031–−.003 | .911/1.097 |
| PD-partner gender∗ | .039 | .025 | .865 | −.415–.492 | .666/1.500 |
| Education∗∗ | −.117 | −.076 | .543 | −.500–.267 | .924/1.083 |
| PD-partner age | −.009 | −.104 | .446 | −.031–.014 | .778/1.285 |
|
| |||||
| Dependent variable = CBS Adj R2 = .527 | |||||
| Predictors | |||||
|
| |||||
| PD-partner MS | −11.541 | −.559 | <.001 | −16.149–−6.933 | .771/1.296 |
| UPDRS III | .447 | .163 | .129 | −.136–1.030 | .852/1.174 |
| NMS | .282 | .081 | .449 | −.462–1.026 | .839/1.191 |
| IQCODE | .251 | .219 | .050 | .000–.503 | .802/1.247 |
| PD-partner gender∗ | 3.023 | .095 | .400 | −4.143–10.188 | .756/1.322 |
| Education∗∗ | 1.178 | .037 | .713 | −5.250–7.607 | .931/1.074 |
| PD-partner age | −.253 | −.148 | .191 | −.636–.131 | .768/1.302 |
Notes: PD: Parkinson's disease, PDQ8SI: the Parkinson's Disease Questionnaire Summery Index, MS: mutuality scale, CBS: caregiver burden scale, NMSQuest: the Non-motor Symptom Questionnaire, UPDRS III: the Unified Parkinson's Disease Rating Scale-Part III, and IQCODE: Informant Questionnaire on Cognitive Decline in the Elderly. Italics: significant predictors.
∗PD-partner gender = 0 = female, 1 = male.
∗∗Education = 0 = either elementary, secondary, or only one with university education and 1 = both with university education.