Although plasma retinol concentrations were markedly higher than those reported in observational studies , no association was observed between plasma retinol and risk for any fracture ( hazard ratio [ HR ] , 0.86 mol/L ; 95 % confidence interval [ CI ] , 0.65-1 .14 ) or osteoporotic fracture ( HR , 0.97 mol/L ; 95 % CI , 0.66-1 .43 ) .