Validation of Parkinson’s Disease-Related Questionnaires in South Africa

Table 5

Factor loadings for the five subscales of the modified PDQ-39.

Subscale/items	Factor 1	Factor 2	Factor 3	Factor 4	Factor 5	Uniqueness
Mobility
Had difficulty doing the leisure activities you would like to do?				0.5068		0.4312
Had difficulty looking after your home, e.g. repairs, housework, cooking?				0.6701		0.4060
Had difficulty carrying bags of shopping?				0.6524		0.3564
Had problems walking to the shops or church?				0.7854		0.2754
Had problems walking to your nearest neighbor?	0.6493					0.3560
Had problems getting around the house as easily as you would like?	0.5024			0.5076		0.4437
Had difficulty getting around the community?						0.4831
Needed someone else to help you when you leave the house?	0.6774					0.4535
Felt frightened or worried about falling over in public?	0.7081					0.3084
Been stuck in the house more than you would like?	0.6207					0.3828
Activities of daily living
Had difficulty washing yourself?	0.8342					0.2364
Had difficulty dressing yourself?	0.8414					0.2301
Had problems doing up your shoelaces?	0.7047					0.3311
Had problems writing clearly?						0.8624
Had difficulty cutting up food?	0.5278					0.5812
Had difficulty holding a drink without spilling it?	0.6658					0.4081
Emotional well-being
Felt depressed?			0.5982			0.4076
Felt isolated and lonely?			0.7209			0.2780
Felt weepy or tearful?			0.7222			0.3093
Felt angry or bitter?			0.6391			0.3011
Felt anxious?			0.7564			0.2631
Felt worried about your future?						0.4039
Stigma
Avoided eating or drinking in public?					0.6980	0.3548
Felt worried by other people’s reaction to you?			0.5338			0.3381
Social support
Had problems with your close personal relationships?					0.5065	0.3413
Lacked support in the ways you need from your spouse or partner?		0.5497				0.5650
Lacked support in the ways you need from your family or close friends?		0.5557				0.4769
Cognition
Unintentionally fallen asleep during the day?					0.5013	0.4569
Had problems concentrating, e.g. when reading or watching TV?		0.6104				0.4447
Felt your memory was bad?		0.7196				0.4351
Had distressing dreams or hallucinations?		0.5846				0.5028
Communication
Had difficulty with your speech?		0.6261				0.4952
Felt unable to communicate with people properly?		0.6193				0.4364
Felt ignored by people?						0.6290
Bodily discomfort
Had painful muscle cramps or spasms?		0.6063				0.4294
Had aches and pains in your joints or body?		0.5619				0.3637
Felt unpleasantly hot or cold regardless of the weather?		0.6999				0.3729

PDQ-39, Parkinson’s Disease Questionnaire.