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Vitamin D status. Serum levels of 25OHD in response to low, medium (Med), or high dietary VitD3 intake for 6 mo. A 10-fold increase in dietary VitD3 corresponded (Table 1) to an approximate twofold increase in 25OHD. [F(2,24) = 55.3; n = 9 rats per group]. *P = 0.01; **P = 0.001. Reported in Table 1 of Keeney et al. (35).
