Figure 2

Seasonally stratified verification of %C3-epi-25(OH)D3 differences in gender and age. Note: The Box height represents a median, and the top and bottom lines of I shape represent the 95%CI of the median. By the Mann–Whitney U test for two gender groups and the Kruskal–Wallis test for multiple age groups, our results showed that %C3-epi-25(OH)D3 had no differences in gender and age during the other seasons except for in summer.