Table 2.

Association between vitamin D from different sources and PD risk

	Odds Ratio	95% CI	P-Value
clinical cutoff analysis
Vit D deficiency ( total 25(OH)D <20 ng/mL)	2.64	(1.88,3.71)	<0.0001
Vit D insufficiency (total 25(OH)D<30 ng/mL)	2.13	(1.58,2.89)	<0.0001
quartile analysis
Total 25(OH) D
Q1 (4.3–21.8 ng/mL)	2.66	(1.76,4.03)	<0.0001 (trend test)
Q2 (21.8–29 ng/mL)	1.89	(1.23,2.91)
Q3 (29–37 ng/mL)	0.92	(0.58,1.46)
Q4 (>37 ng/mL)	Reference
25(OH) D2
Q1 (<1 ng/mL)	2.04	(1.24,3.37)	<0.0001 (trend test)
Q2 (1–3.25 ng/mL)	1.84	(1.02,3.33)
Q3 (3.25–8 ng/mL)	1.46	(0.80,2.69)
Q4 (>8ng/mL)	Reference
25(OH) D3
Q1 (6–19.3 ng/mL)	2.39	(1.60,3.58)	<0.0001 (trend test)
Q2 (19.3–26.0 ng/mL	1.42	(0.92,2.18)
Q3 (26.0–34.1 ng/mL)	1	(0.65,1.56)
Q4 (>34.1 ng/mL)	Reference