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Fig. 2 Left forearm BMD and BMC of children measured by DXA. Panel A and D: Violin plots for BMD and BMC in both groups measured at the baseline and week 10; the difference between the two groups was compared by the Wilcoxon test. Panel B and E: Bar plots for the absolute changes in BMD and BMC during the intervention and the intervention effect analyzed by the linear mixed-effects model. Panel C and F, Bar plots for the percentage changes in BMD and BMC during the intervention and the intervention effect analyzed using the general linear regression model. For BMC analysis, the bone area was adjusted. * P < 0.05; ** P < 0.01; *** P < 0.001; NS, not significant; error bars show 95% confidence intervals. BMD, bone mineral density; BMC, bone mineral content.