(Top) In the infant population, no statistically significant trend was present for 3-epi-25(OH)D3; however, a significant negative trend for % 3-epi-25(OH)D3 (τ = −0.28, p < 0.001) and a significant positive trend for 25(OH)D3 (τ = −0.27, p = 0.003) were observed. (Bottom) For patients aged 1–94 y, no statistically significant trend was present for corrected 25(OH)D3; however, a significant negative trend was observed for 3-epi-25(OH)D3 (τ = −0.20, p < 0.001) and % 3-epi-25(OH)D3 (τ = −0.27, p < 0.001). Units for 25(OH)D3 and 3-epi-25(OH)D3 are nmol/l.