Table 2.

Coefficient of correlation of Spearman (r) and p-value between age, motor function and PDQ-39 among different H&Y stages.

Variables	H&Y Stage I		H&Y Stage II		H&Y Stage III
	r	p	r	p	r	p
Age	0.162	0.133	−0.22	0.850	−0.083	0.476
BMI	−0.034	0.756	0.007	0.850	−0.054	0.640
MDS-UPDRS Part III	0.252*	0.019	0.181	0.109	0.619*	<0.001
BBS	−0.088	0.416	−0.333*	0.003	−0.489*	<0.001
TUG (seconds)	0.238*	0.036	0.302*	0.006	0.312*	0.006
FTSST (seconds)	0.156	0.148	0.301*	0.007	0.255*	0.027
Knee flexion strength (N·m)	−0.182	0.092	−0.205	0.068	−0.359*	<0.001
Knee extension strength (N·m)	−0.145	0.180	−0.218	0.052	−0.399*	<0.001
FOG	0.471*	<0.001	0.386*	<0.001	0.653*	<0.001
Step length (m)	−0.226*	0.035	−0.182	0.107	−0.449*	<0.001
Speed of gait (m/s)	−0.183	0.090	−0.146	0.196	−0.346*	0.002
Toe-off angle (°)	−0.227*	0.034	0.209	0.062	−0.238*	0.038

BMI, body mass index; MDS-UPDRS, movement disorder society–sponsored revision of the Unified Parkinson’s Disease Rating Scale; BBS, Berg Balance Scale; TUG, timed up-to-go test; FTSST, five times sit-to-stand test; FOG, freezing of gait. *Indicates a significant correlation between age, motor function and PDQ-39.