Table 1.

Comparison of vitamin D serum levels among three study groups based on Kruskal Wallis test

	Group size	Mean	Std. Deviation	Mean rank	Minimum	Maximum	P-value
Control	50	22.04	10.92	74.77	4.00	60.40	0.0001
CRSwNP	32	12.52	9.93	40.77	4.00	45.00
CRSsNP	35	15.54	10.09	53.14	4.00	49.00
Total	117	17.49	11.11		4.00	60.40

CRSwNP: chronic rhinosinusitis with nasal polyposis, CRSsNP: chronic rhinosinusitis without nasal polyposis