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Adjusted nonlinear relation between 25(OH)D concentrations and mortality, with 25 ng/mL as the reference for HIV-infected children (n = 253). The solid line shows the estimated HR for 25(OH)D concentrations relative to the reference concentration of 25 ng/mL, with the horizontal dotted line designating an HR of 1.0. The 95% CIs for the HR are represented by the dashed lines. The P value for the nonlinear relation is <0.01. 25(OH)D, 25-hydroxyvitamin D.
