Figure 2:

Scatterplots and boxplots of 25(OH) vitamin D and IgG concentrations partitioned by ethnicity.

25(OH) vitamin D scatterplot (A) and boxplot (B), as well as IgG scatterplot (C) and boxplot (D) compare serum concentrations between participants of different ethnicities in the prospective analysis. Mean values (unadjusted for age) are shown in the top left corner of boxplots. p-Values shown in boxplots were calculated while adjusting for age, as age difference is indicated by previous CALIPER reference interval studies [3], [4]. Statistically significant ethnic differences were found to exceed RCVs (see Table 1). Note: outliers are not shown in scatterplots and boxplots. IgG, immunoglobulin G. Values are in SI units.