Table 5.

Linear regression analysis of factors influencing caregiver burden measured by the disease specific assessment tool PDCB (n = 119).

	r	R 2	Beta	p
PDQ-8	0.563	0.317	0.563	<0.001 **
MDS-UPDRS part II	0.610	0.372	0.610	<0.001 **
Patient BDI	0.432	0.187	0.432	<0.001 **
Patient TAS-26	0.373	0.139	0.373	<0.001 **
Patient TAS-26 F1	0.352	0.124	0.352	<0.001 **
Patient TAS-26 F2	0.333	0.111	0.334	0.001 **
Patient TAS-26 F3	0.145	0.021	0.147	0.138
Caregiving hours per day	0.475	0.225	0.475	<0.001 **
Caregiver SF-36	0.541	0.292	−0.541	<0.001 **
Caregiver SF-36 Physical Health	0.446	0.199	−0.446	<0.001 **
Caregiver SF-36 Mental Health	0.584	0.341	−0.584	<0.001 **
Caregiver BDI	0.513	0.263	0.513	<0.001 **
Caregiver TAS-26	0.324	0.105	0.324	0.001 **
Caregiver TAS-26 F1	0.255	0.065	0.256	0.008 *
Caregiver TAS-26 F2	0.176	0.031	0.0177	0.069
Caregiver TAS-26 F3	0.281	0.079	0.280	0.004 *

Linear regression analysis of patient and caregiver factors contributing to caregiver burden. p-value adjustment for multiple comparisons was 0.05/14. * indicates significant correlations at p < 0.05; ** indicate significance level at p < 0.004 printed in bold. Abbreviations: BDI, Beck depression inventory; MDS-UPDRS, Movement Disorders Society unified Parkinson’s disease rating scale; PDCB, Parkinson’s disease caregiver burden inventory; PDQ-8, Parkinson’s disease questionnaire 8; SF-36, short form 36 health survey; TAS-26 Toronto alexithymia scale 26 (F1: difficulties identifying feelings, F2: difficulties describing feelings, and F3: external oriented thinking).