Table 4.

List of keywords cluster labels of postural control studies in patients with PD among the 1,295 articles included (2011–2021).

Cluster-ID	Size	Silhouette	Cluster name	Cluster labels (LLR)
#0	46	0.895	Freezing of gait	Gait initiation; levodopa; anticipatory postural adjustments; and dynamic stability
#1	37	0.841	Dementia	Balance; nonmotor symptom; biomarker; and postural balance
#2	31	0.870	Postural balance	Accidental falls; exercise therapy; risk factors; and rehabilitation
#3	30	0.935	Postural control	Parkinson’s disease; postural instability; falls; and posturography
#4	30	0.875	Impairment	Risk; freezing of gait; balance dysfunction; and progression
#5	29	0.785	Parkinson’s disease	Fear of falling; clinical test; and Parkinson & apos
#6	29	0.814	Rehabilitation	Postural instability; program; muscle strength; and stroke
#7	28	0.844	Cognitive impairment	Rating scale; physical therapy; older adults; and Alzheimer’s disease
#8	27	0.897	Deep brain stimulation	Subthalamic nucleus; basal ganglia; globus pallidus; and pedunculopontine nucleus
#9	26	0.789	Reliability	Fall risk; scale; virtual reality; and postural instability gait difficulty
#10	26	0.943	Substantia Nigra	Progressive supranuclear palsy; multiple system atrophy; balance; and pedunculopontine tegmental nucleus

^*LLR is Log-Likelihood Ratio.