Table 2.

The Hoehn and Yahr severity

From the onset	No.	Hoehn and Yahr	0 degree		1st degree		2nd degree		3rd degree		4th degree		5th degree		3rd or less
5 years or less	135	2.24 ± 0.98	10	7.4%	6	4.4%	75	55.6%	31	23.0%	11	8.1%	2	1.5%	122	90.4%
6–10 years	158	2.54 ± 0.94	6	3.8%	2	1.3%	78	49.4%	46	29.1%	24	15.2%	2	1.3%	132	83.5%
11–15 years	114	2.91 ± 0.88	0	0.0%	0	0.0%	47	41.2%	33	28.9%	31	27.2%	3	2.6%	80	70.2%
16–20 years	53	3.28 ± 0.94	0	0.0%	0	0.0%	12	22.6%	20	37.7%	15	28.3%	6	11.3%	32	60.4%
21 years or more	38	3.00 ± 0.86	0	0.0%	0	0.0%	12	31.6%	16	42.1%	8	21.1%	2	5.3%	28	73.7%
Total	498	2.66 ± 0.99	16	3.2%	8	1.6%	224	45.0%	146	29.3%	89	17.9%	15	3.0%	394	79.1%

Mean ± standard deviation