Table 1.

Mean vitamin D serum level according to year seasons in the compared groups.

	Group 1 Vitamin D [ng/mL]	Group 2 Vitamin D [ng/mL]	p-Value
Spring	38 ± 20	32 ± 15	0.01 *
Summer	40 ± 17	30 ± 11	0.00 *
Autumn	37 ± 25	32 ± 13	0.04 *
Winter	30 ± 14	30 ± 19	0.87

*—statistically significant.