Table 1.

Demographics of participants included in classification modelling and statistical analysis.

Parameters	Independent control	Drug naïve PD	Medicated PD
n	56	80	138
Age (years)a	54.3 ± 14.4	69.8 ± 9.4	70.3 ± 8.2
BMI (kg/m2)a	26.1 ± 4.4	25.8 ± 4.9	26.3 ± 5.4
Gender (Male:Female)b	0.87	1.76	1.65
Alcohol intake (Yes:No)c	4.60	1.76	1.81
Smoker (Yes:No)c	0.08	0.07	0.00

BMI body mass index.

^aBMI and age values are expressed as mean ± standard deviation.

^bExpressed as a ratio (Male:Female).

^cExpressed as a ratio (Yes:No).