Table 3.

Correlation Between Polysomnography Derived Sleep Parameters and DaTSCAN Quantification in iRBD Patients (n=12)

Spearman Correlation		Right COR	Left COR	Right POR	Left POR
TST	r	0.622	0.546	0.723	0.585
	P	0.031*	0.066	0.008*	0.046*
WASO	r	−0.531	−0.630	−0.575	−0.501
	P	0.075	0.028*	0.051	0.097
SL	r	−0.004	−0.191	−0.209	−0.256
	P	0.991	0.552	0.514	0.422
SE	r	0.650	0.592	0.804	0.683
	P	0.022*	0.043*	0.002*	0.014*
REM L	r	−0.396	−0.365	−0.108	−0.178
	P	0.228	0.269	0.753	0.600
AHI	r	0.053	0.200	0.016	0.040
	P	0.871	0.533	0.961	0.901
PLMI	r	−0.175	−0.207	0.105	−0.039
	P	0.587	0.519	0.745	0.905
%N1	r	0.266	0.428	0.301	0.484
	P	0.403	0.165	0.343	0.111
%N2	r	−0.189	−0.252	−0.232	−0.287
	P	0.557	0.429	0.469	0.365
%N3	r	−0.119	−0.291	−0.196	−0.291
	P	0.713	0.359	0.540	0.359
%REM	r	0.434	0.711	0.497	0.609
	P	0.159	0.010*	0.100	0.035*

Note: *(in bold), denotes statistically significant results (P< 0.05).

Abbreviations: %, percentage; AHI, apnoea/hypopnoea index; COR, caudate to occipital ratio; DaTSCAN, 123I-2β-carbomethoxy-3β-(4-iodophenyl)-N-(3-fluoropropyl)-nortropane (123I-FP-CIT) SPECT; N, number; N1-3, non-REM sleep stages 1–3; NREM, non-rapid eye movement sleep; P, Spearman’s rank correlation P value; PLMI, periodic limb movement index; POR, putamen to occipital ratio; r, Spearman’s rank correlation rho value; REM, rapid eye movement; SE, sleep efficiency; SL, sleep latency; TST, total sleep time; WASO, wakefulness after sleep onset.