Fig. 2
FINGER intervention effects on the change in 27-OH. Participants were divided into two groups according to their baseline 27-OH levels: the lowest 75% (quartiles 1–3, white boxplots) and the highest 25% (quartile 4, gray boxplots). The graph shows the mean change in 27-OH levels (ng/ml) between the 2-year and baseline measurements. Mann-Whitney non-parametric U test was used to analyze the differences between quartiles 1–3 and 4 of the intervention group (##< 0.01) and between quartile 4 of the control and intervention group (*p < 0.05)