In adjusted models , 25-hydroxyvitamin D concentrations of 50-74 nmol/L and 75 nmol/L or greater compared with less than 30 nmol/L were associated with 43 % ( 95 % confidence interval [ CI ] 0.33-0 .99 ) and 54 % ( 95 % CI 0.24-0 .87 ) reductions in risk of SGA , respectively .