Table 2.

Plasma concentration of 25-OH-D [ng/ml] in study participants

Group	SE	SC	OE	OC	p (between groups)
Test I	19.10 ± 1.40	14.13 ± 5.08	30.53 ± 0.34	36.16 ± 4.47	0.000
Test II	41.23 ± 8.63	40.60 ± 10.62	41.24 ± 7.92	50.30 ± 8.49	0.127
p (Test I vs. Test II)	0.005	0.018	0.018	0.028

Results are shown as means ± SEM (SE – experimental group with suboptimal level of vitamin D, SC – control group with suboptimal level of vitamin D, OE – experimental group with optimal lever of vitamin D, OC – control group with optimal level of vitamin D); p (between groups) Kruskal-Wallis test; p (Test I vs Test II) Wilcoxon test