Table 2.

Number of subjects in three sub-datasets of Parkinson’s Disease database (gaitpdb) [8] based on the HY rating scale of severity.

Author	Stage 0	Stage 2	Stage 2.5	Stage 3
Ga [21]	18	15	8	6
Ju [22]	26	12	13	4
Si [23]	29	29	6	0