		Level of vitamin D	Duration of PD	Age in years	Hx of head injury	Hx of alcohol intake	Cigarette smoking	Pesticide contact Hx	Family history	BMI
Level of vitamin D	Pearson Correlation	1	−0.649**	−0.656**	0.153*	−0.059	−0.037	−0.042	0.013	0.036
Level of vitamin D	Sig. (2-tailed)		0.000	0.000	0.017	0.358	0.566	0.512	0.840	0.572
Duration of Parkinson’s disease	Pearson Correlation	−0.649**	1	0.814**	−0.129*	0.021	−0.077	0.130*	−0.014	0.013
Duration of Parkinson’s disease	Sig. (2-tailed)	0.000		0.000	0.045	0.742	0.232	0.043	0.832	0.840
Age in years	Pearson Correlation	−0.656**	0.814**	1	−0.065	−0.030	−0.198**	0.019	−0.098	0.004
Age in years	Sig. (2-tailed)	0.000	0.000		0.314	0.646	0.002	0.771	0.128	0.953
History of head injury	Pearson Correlation	0.153*	−0.129*	−0.065	1	−0.064	−0.164*	−0.055	−0.180**	0.002
History of head injury	Sig. (2-tailed)	0.017	0.045	0.314		0.318	0.011	0.389	0.005	0.975
History of alcohol intake	Pearson Correlation	−0.059	0.021	−0.030	−0.064	1	0.001	0.065	0.882**	0.030
History of alcohol intake	Sig. (2-tailed)	0.358	0.742	0.646	0.318		0.990	0.314	0.000	0.641
Cigarette smoking	Pearson Correlation	−0.037	−0.077	−0.198**	−0.164*	0.001	1	−0.114	0.044	0.006
Cigarette smoking	Sig. (2-tailed)	0.566	0.232	0.002	0.011	0.990		0.077	0.493	0.925
Pesticide contact hx	Pearson Correlation	−0.042	0.130*	0.019	−0.055	0.065	−0.114	1	0.074	0.001
Pesticide contact hx	Sig. (2-tailed)	0.512	0.043	0.771	0.389	0.314	0.077		0.253	0.982
Family history	Pearson Correlation	0.013	−0.014	−0.098	−0.180**	0.882**	0.044	0.074	1	0.078
Family history	Sig. (2-tailed)	0.840	0.832	0.128	0.005	0.000	0.493	0.253		0.225
Body Mass Index	Pearson Correlation	0.036	0.013	0.004	0.002	0.030	0.006	0.001	0.078	1
	Sig. (2-tailed)	0.572	0.840	0.953	0.975	0.641	0.925	0.982	0.225
	N	243	243	243	243	243	243	243	243	243