Table 2.

Mean vitamin D levels in the groups.

Classification of vitamin D level	N		Percentage
Severe deficiency (<10)	120		21.6
Deficiency (<11–20)	237		42.7
Insufficiency (<21–30)	108		19.5
Sufficiency (>30)	90		16.2
Feature	n	Vitamin D (ng/mL), mean ± SD	p-value
Female	229	19.35 ± 14.83	0.437
Male	326	20.54 ± 12.61
Feature	n	Vitamin D (ng/mL), mean ± SD	p-value
Outdoor athletes	162	18.40 ± 11.15	0.054
Indoor athletes	393	20.73 ± 14.41
Feature	n	Vitamin D (ng/mL), mean ± SD	p-value
Autumn months	155	28.13 ± 17.53	0.000*
Winter months	400	16.92 ± 10.10

SD: standard deviation.