TABLE 2.

Mean number of signs for different age ranges (retrospectively gathered data)

	< 40 years	41–50 years	51–60 years	61–70 years	> 71 years
PD
n	93	82	55	13	13
Mean	0.72	1.9	3.6	5.3	5.9
SD	1.73	2.4	3	3.6	3.5
Range	0–10	0–9	0–14	0–10	2–14
Controls
n	93	92	78	34	34
Mean	0.26	0.3	1.2	2.3	2.8
SD	0.64	0.7	1.3	2	2
Range	0–3	0–3	0–6	0–6	0–6
P-value (Mann-Whitney-test)	0.175	<0.001	<0.001	0.01	<0.001

Bonferoni correction for multiple comparisons: significance at P < 0.01.