Table 3.

Association of increasing serum 25(OH)D levels with non- melanoma skin cancer

25(OH)D (ng/mL)	Odds ratio (OR) and 95% CI
	Base modela	Fully adjusted modelb
Q1 (<16)	1.00 (referant)	1.00 (referant)
Q2 (16–20.8)	0.94 (0.56–1.55)	0.94 (0.56–1.55)
Q3 (20.9–25.1)	0.91 (0.55–1.55)	0.93 (0.56–1.54)
Q4 (25.2–29.8)	0.84 (0.50–1.42)	0.86 (0.51–1.45)
Q5 (29.9–58.3)	0.53 (0.30–0.93)	0.54 (0.31–0.96)
P trend	0.032	0.044
≥29.9 ng/mL (Q5 vs. Q1–Q4)	0.57 (0.35–0.93)	0.60 (0.37–0.98)
≥32.0 ng/mL	0.57 (0.33–0.98)	0.59 (0.34–1.01)

^aAdjusted for age (continuous variable), BMI (continuous variable), season of blood draw, and clinic site

^bAdjusted for age, BMI, season of blood draw, clinic site, outdoor walking activity (continuous variable), and cigarette smoking (yes/no)