Fig. 3

Correlation between C3-epi-D3 levels and Ca-IP in summer. Line-heatmap of Spearman correlation between C3-epi-D3 levels and Ca-IP: A during autumn; B during winter. The line and heatmap visually display the magnitude of Spearman correlation coefficient and the distribution of observation points, respectively. Our results suggested an evident correlation between C3-epi-D3 levels and Ca-IP during autumn and winter