After adjusting for dietary and supplemental vitamin intake , serum retinol increased 3.0 1.4 g/dL ( coefficient standard error ) ( adjusted R2 = 0.02 , P = 0.03 ) and vitamin K status improved as demonstrated by a decreased percentage of undercarboxylated osteocalcin of -6.0 % 1.6 % by 12 months ( adjusted R2 = 0.15 , P < 0.001 ) .