Table 3. Correlation analysis of continuous variables associated with baseline concentrations of serum 25(OH)D.

	COPD		Controls
	Pearson’sr	P	Pearson’sr	P
Age, years	0.073	0.130	0.375	<0.001
FEV1 in percent predicted	0.271	<0.001	0.000	0.995
Resting PaO2 §	0.152	0.003	0.045	0.428
Total white blood count	−0.112	0.023	−0.076	0.202

^#BMI: Body mass index.

^§PaO₂: Arterial oxygen tension.