TABLE 3.

Relative risks (RRs) with 95% confidence intervals (CIs) for Parkinson’s disease cases by baseline serum 25(OH)D.

			Serum 25(OH)D
	1st quartile	2nd quartile	3rd quartile	4th quartile	p for trend
Number of Parkinson’s disease cases	17	15	10	8
Sex– and age–adjusted model	1.00	0.73 (0.36–1.46)	0.47 (0.21–1.03)	0.35 (0.15–0.81)	0.006
Multivariate model A	1.00	0.72 (0.36–1.46)	0.48 (0.22–1.08)	0.33 (0.14–0.80)	0.006
Multivariate model B	1.00	0.72 (0.36–1.45)	0.48 (0.21–1.07)	0.33 (0.14–0.78)	0.005

Model A further included marital status (married, others), education (basic, intermediate or high), alcohol consumption (0, <5, ≥5 g/day), leisure-time physical activity (no or light, heavy), smoking status (none, current), body mass index, and month of blood drawn.

Model B further included hypertension and serum cholesterol.

Quartiles for men 8–28, 29–41, 42–56, 57–159 nmol/l; for women 7–25, 26–36, 37–49, 50–151 nmol