Quantification and recognition of parkinsonian gait from monocular video imaging using kernel-based principal component analysis

Table 5 Kinematic and spectral gait parameters (Mean ± SD)

	Non-PD (n = 12)	Drug-Off (n = 12)	Drug-On (n = 12)	BMI	AGE
Gait cycle time (s)	1.21 ± 0.08	1.16 ± 0.15	1.15 ± 0.12	N.S	N.S
Stride length (cm)	105.48 ± 6.95	85.54 ± 17.21	^ξ105.94 ± 22.90	N.S	N.S
Walking velocity (cm/s)	87.35 ± 8.45	76.35 ± 22.84	93.68 ± 23.35	N.S	N.S
Cadence (steps/min)	99.33 ± 6.04	106.45 ± 15.09	105.88 ± 12.33	N.S	N.S
Step frequency (Hz)	1.66 ± 0.11	1.48 ± 0.34	^ξ1.74 ± 0.18	N.S	N.S
EL (%)	9.55 ± 7.84	16.21 ± 9.60	^ξ9.40 ± 4.56	N.S	N.S
EM (%)	*75.07 ± 9.36	63.89 ± 11.63	72.58 ± 8.63	N.S	N.S
EH (%)	15.37 ± 3.10	19.88 ± 8.25	18.00 ± 6.31	N.S	N.S

*, ^ξ are significant (p < 0.05) regarding the non-PD control and PD patients in the "Drug-Off" state and PD patients in the "Drug-Off" and "Drug-On" states. EL, EM, and EH are the percent of energy distributed in the low-frequency band, main-frequency band, and high-frequency band, respectively. Interactions between factors (BMI and AGE) and Groups (Non-PD and Drug-Off) were assessed by ANCOVA. N.S is non-significant (p > 0.05).

ISSN: 1475-925X