Table 10.

Stepwise regression (N = 96)

Model 1: Independent variable = SF-36 scales			Model 2: Independent variable = significant SF-36 scales from Model 1 (P < 0.10) + PDQUALIF items + PDQ-39 items
R2; Adjusted R2	Scales	P value	R2; Adjusted R2	Scales	P value
Criterion variable #1: How PD affects on day-to-day basis			Criterion variable #1: How PD affects on day-to-day basis
0.50; 0.48	Social Function	0.001	0.67; 0.65	Social Functiona	0.09
	Physical Function	0.003		Physical Functiona	0.005
	Role Limitations—Physical	0.01		Role Limitations—Physicala	0.004
			PDQUALIF items
			Financial strain	Self-image/sexuality	0.04
			Adjust to change	Social Role Function	0.003
			Sleep with partner	Sleep	0.03
			PDQ-39 items
			Getting around house	Mobility	0.006
			Memory	Cognitions	0.002
Criterion variable #2: Quality of life rating			Criterion variable #2: Quality of life rating
0.47; 0.45	Role Limitations—Physical	0.02	0.69; 0.65	Role Limitations—Physicala	0.19
	General Health	0.01		General Healtha	0.002
	Role Limitations—Emotional	0.04		Role Limitations—Emotionala	0.59
	Emotional Well-Being	0.06		Emotional Well-Beinga	0.004
			PDQUALIF items
			Sexual ability	Self-image/sexuality	0.005
			Future	Outlook	<0.001
			Ask for help		0.02
			Independent hygiene	Independence	0.02
			PDQ-39 items
			Confined to the house	Mobility	0.001
			Isolated and lonely	Emotional Well-Being	0.006
			Concentration	Cognitions	0.006
Criterion variable #3: Rating of severity of PD symptoms			Criterion variable #3: Rating of severity of PD symptoms
0.42; 0.40	Physical Function	0.006	0.71; 0.67	Physical Functiona	0.10
	Social Function	0.03		Social Functiona	0.93
	General Health	0.07		General Healtha	0.24
	Role Limitations—Physical	0.07		Role Limitations—Physicala	0.02
			PDQUALIF items
			Imbalance	Social/Role Function	0.001
			Usual share of work in home		0.02
			Self-concept/image	Self-Image/Sexuality	0.009
			Sexual ability		0.005
			PDQ-39 items
			Memory	Cognitions	<0.001
			Hallucinations		0.008
Criterion variable #4: PHQ-9 scoring categories			Criterion variable #4: PHQ-9 scoring categories
0.65; 0.64	Emotional well being	0.008	0.81; 0.78	Emotional well beinga	0.51
	Pain	0.009		Paina	0.02
	Energy	0.001		Energya	0.03
	Role Limitations—Emotional	0.007		Role Limitations—Emotionala	0.003
			PDQUALIF items
			Financial strain	Self-Image/Sexuality	0.002
			Sleep maintenance	Sleep	0.001
			Outlook	Outlook	<0.001
			PDQ-39 items
			Close relationship	Social Support	0.001
			Concentration	Cognitions	0.008

^aForced into Model 2 based on significance in Model 1