Table 4. Regression coefficients for the relationship between subject status and serum levels of 25(OH)D, adjusted for sex, age, BMI, smoking, comorbidities and season.

	25(OH)D†			25(OH)D* (<20 ng/mL)
	Coef.	CI	p	OR	CI	p
Study category
Controls	0			1
COPD subjects	−4.34	−6.31,−2.37)	p<0.001	2.32	(1.43,3.75)	p = 0.001

^†Linear regression model.

^*Logistic regression model.