Table 4

Spearman correlations

		NMSS total score	Cardiovascular	Sleep/fatigue	Mood/apathy	Perceptual problems/hallucinations	Attention/memory	Gastrointestinal	Urinary	Sexual functions	Miscellaneous
PDQ-8 SI	r	0.517***	0.063	0.523***	0.256*	0.176	0.274*	0.079	0.334**	0.095	0.377**
	p	<0.001	0.59	<0.001	0.026	0.129	0.016	0.497	0.003	0.413	0.001
	n	76	76	76	76	76	76	76	76	76	76

Correlation coefficients for significant results are highlighted in bold.
Correlation coefficients were ‘weak’ (r=0.200–0.399) for mood/apathy, attention/memory, urinary symptoms, sexual functions and miscellaneous domains, and ‘moderate’ (r=0.400–0.599) for the sleep/fatigue domain and the NMSS total score.
*p < 0.050, **p < 0.010, ***p < 0.001.
NMSS, Non-motor Symptom Scale; PDQ-8 SI, 8-item Parkinson’s Disease Questionnaire Summary Index.