Table 2.

Variables at a glance in relation to conceptual and theoretical perspectives

ICF (WHO, 2001)
	• Personal factors: e.g. sex, age, coping, self-efficacy
	• Body functions: e.g. motor and cognitive symptoms, pain
	• Activity: e.g. activities of daily living (ADL), walking
	• Participation: e.g. recreation and leisure, social interactions
	• Environmental factors: e.g. physical environmental barriers, assistive products and technology, support by others, and relationships
P-E fit and perceived aspects of home
	• Personal component (P): functional limitations and dependence on mobility devices
	• Environmental component (E): physical environmental barriers
	• Perceived aspects of home: housing satisfaction, usability of the home, meaning of home and housing-related control beliefs
PD-specific aspects/problems
	• Motor symptoms: tremor, brady- and hypokinesia
	• Non-motor symptoms: e.g. depression and fatigue
	• Gait: e.g. freezing of gait (FOG)
	• Balance problems: e.g. near falls, falls, fall-related self-efficacy, activity avoidance due to the risk of falling, dual task difficulties, and a clinical assessment of the postural response in relation to an external perturbation
	• Complications of therapy: e.g. experiencing fluctuations and/or dyskinesias
Since people with PD suffer from slowness and difficulties in performing daily transfers, two timed tests are included that tap mobility: walking and rising from a chair.

Abbreviations: ICF = the International Classification of Functioning, Disability and Health, P-E fit = Person-Environment fit, PD = Parkinson’s disease, WHO = World Health Organization.