Table 1.

Frequency of serum 25-OHD deficiency insufficiency and sufficiency in patients with chronic obstructive pulmonary disease versus controls

Serum 25-OHD level	Patients N (%)	Controls N (%)	P values
< 20 ng/ml	14(15.6)	46(46)	0.001
20-29 ng/ml	46(51.1)	20(20.)	0.001
≥30 ng/ ml	30(33.3)	34(34)	0.52