TABLE 1.

Description of cohorts.

Cohort	Control	PD	Description
1	10	38	Section 2.5. Recruited to ensure both normal walkers (N = 21) and PwP with clearly affected gait (N = 27)
2	190	-	Section 2.7. No history of PD or other neurodegenerative disorder. Aged 60 years or over (mean age of 70 (SD=6).
3	-	155	Section 2.7. Mean age 69 years (SD=5). Relevant clinical scales and demographic scores are in Table 4.