Fig. 1: Variations in grain Zn, Fe, protein and phytate concentrations among different species of cultivated wheat on a dry weight basis.
a–d, Grain Zn (a), Fe (b), protein (c) and phytate (d) concentrations. The values beside each violin represent the number of studies and the total number of observations (in parentheses) available. The P values correspond to the Kruskal–Wallis test assessing equality of medians, with P < 0.05 indicating a significant difference between sample medians. The whiskers represent the most extreme points (minima and maxima). The circles represent possible outliers, while the stars represent probable outliers. The notches in the box plots represent an approximate 95% CI of the median.
