Table 1.

Comparison of baseline data between the observation and control groups.

Group	Sex (male/female)	Mean age ($\overline{x}$ ± s, year)	Mean duration ($\overline{x}$ ± s, year)	Parkinson's disease evaluation scale score ($\overline{x}$ ± s, score)	Family history (n, %)
Observation (n = 34)	20/14	52.67 ± 7.68	5.58 ± 1.51	35.26 ± 7.26	7 (20.59)
Control (n = 34)	22/12	53.53 ± 8.29	5.77 ± 1.82	36.98 ± 8.03	9 (26.47)
t/x 2	0.249	0.444	0.468	0.926	0.327
P	0.318	0.659	0.641	0.358	0.567