(c)  

Year 3
	HC DAT n = 16  IBZM n = 16		PD DAT n = 22  IBZM n = 17			MSA DAT n = 7  IBZM n = 5			PSP DAT n = 3  IBZM n = 5			Mann-Whitney U test
	Mean	95% CI	Mean	95% CI	PD versus HC	Mean	95% CI	MSA versus HC	Mean	95% CI	PSP versus HC	PD versus MSA	PD versus PSP	MSA versus PSP
					P*			P*			P*	P	P	P
Caudate DAT	4.35	4.06–4.63	2.83	2.55–3.12	<0.001	2.70	2.28–3.12	<0.001	2.38	1.80–2.96	<0.001	ns	ns	ns
Putamen DAT	3.96	3.71–4.21	2.13	1.97–2.30	<0.001	2.03	1.80–2.26	<0.001	1.92	1.50–2.34	<0.001	ns	ns	ns
Striate DAT	4.14	3.88–4.40	2.45	2.24–2.67	<0.001	2.33	2.03–2.63	<0.001	2.12	1.64–2.61	<0.001	ns	ns	ns
Striate IBZM	1.70	1.65–1.75	1.66	1.61–1.72	1.0	1.92	1.71–2.13	0.003	1.70	1.57–1.83	1.00	0.002	ns	0.016

Left and right uptake ratios are averaged.*One way ANOVA, Bonferroni post-hoc test P value. 95% CI: 95% confidence interval.