Table 2.

Comparison of vitamin D levels in asthmatic patients and controls

Vitamin D levels	Patients	Controls
Deficient (<20 ng/mL)	17	0
Insufficient (20–29 ng/mL)	16	6
Sufficient (≥30 ng/mL)	6	24

Notes: Fisher test, P = 0.000; Chi squared test for linear trend = 30.303, P = 0.000.