Could vitamin D deficiency have an impact on motor and cognitive function in Parkinson’s disease?

Table 5 Correlation between Modified Hoehn and Yahr staging and UPDRS and serum vitamin D level

	Vitamin D
	(r) coefficient	P value
Modified Hoehn and Yahr staging	− 0.573	0.003*
UPDRS
Motor
Tremor	− 0.383	0.059
Rigidity	− 0.446	0.025*
Postural instability	− 0.774	< 0.001*
Bradykinesia	− 0.452	0.023*
Total score	− 0.505	0.01*
Mentation	− 0.753	< 0.001*
Activities	− 0.494	0.012*
Complication of medication	− 0.474	0.017*
Other complication	− 0.416	0.039*
Total UPDRS	− 0.582	0.002*