The rate of protein insufficiency ( transthyretin concentration less than @ mg/dL ) did not differ statistically between children receiving test or conventional substitute ( recruitment @ % vs @ % ; end of the trial @ % vs @ % ) but mean transthyretin recovered over @ mg/dL in children who received the test substitute , increasing from @ to @ mg/dL ( mean change , @ mg/dL ; @ % confidence interval @ to @ mg/dL ) .