Table 1. Demographic characteristics of study population.

Group	Insulin	Placebo	p
N	8	6
Age	63.3 ± 6.2	62.2 ± 9.6	0.59
Gender (M/F)	6/2	3/3	0.33
Race (W,AA)	7/1	6/0	0.27
Body Mass Index	23.9 ± 4.1	28.8 ±6.5	0.67
Disease duration (years)	6.8 ± 5.1	4.6 ± 1.7	0.72
Levodopa equivalent. (mcg)	733.8 ± 749.7	778.2 ±193.3	0.36

Mean ± SD, Kolmogorov-Smirnov and Chi-squared tests were used for between group comparisons.