Table 3.

ORs and 95% CIs for Parkinson’s disease by outdoor activity, vitamin D intake, and vitamin D intake×outdoor activity in the same model

Level	Outdoor activity			Total vitamin D intake			Vitamin D intake×outdoor activity OR (95% CI)
	Time (h/week)	n case/n control	Adjusted OR (95% CI)	Intake (μg/d)	n case/n control	Adjusted OR (95% CI)
Reference	<4	119/89	1	<8	62/44	1
Higher level	>4	89/121	0.494 (0.279, 0.877)	>8	51/52	0.613 (0.348, 1.080)	1.231 (0.559, 2.711)
P for trend			0.016			0.09	0.606

n _case/n _control: the number of cases to the number of controls. Adjusted OR: adjusted for sex, age, smoking, alcohol use, education, and BMI