We found no statistically significant association between 25 ( OH ) D concentrations < 10 ng/mL and mortality for HIV-infected ( HR : 1.43 ; 95 % CI : 0.74 , 2.78 ; P = 0.29 ) and HIV-exposed ( HR : 1.56 ; 95 % CI : 0.60 , 4.03 ; P = 0.36 ) infants .