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. 2012 Mar 16;4(3):197–207. doi: 10.3390/nu4030197

Table 3.

Predictors of 25(OH)D Levels.

Characteristic Predictors of 25(OH)D Levels (nmol/L) Predictors of Low 25(OH)D Levels (<50 nmol/L) Predictors of High 25(OH)D Levels (≥75 nmol/L)
β (95% CI) OR (95% CI) OR (95% CI)
Female 12.7 (3.6, 21.7)
p = 0.007		 0.3 (0.1–0.7)
p = 0.01		 3.2 (1.1–9.4)
p = 0.04
White race 21.7 (11.7, 31.7)
p < 0.001		 0.2 (0.1–0.6)
p = 0.002		 3.5 (1.0–12.4)
p = 0.051
If traveled in past 3 months, lowest latitude traveled to (per ↓10° latitude) * 6.3 (2.0, 10.5)
p = 0.005		 0.6 (0.3–1.1)
p = 0.10		 1.8 (1.1–2.8)
p = 0.01
Vitamin D supplement dosage in past 30 days (per ↑100 IU) 1.1 (0.04, 2.1)
p = 0.04		 0.9 (0.8–1.1)
p = 0.49		 1.1 (1.0–1.3)
p = 0.04

Abbreviations: 25(OH)D: 25-hydroxyvitamin D; β: β-coefficient; OR: Odds ratio; * Individuals who did not travel during the past 3 months were assigned the latitude of Boston (42°).