 Objective 1: The validity of the scale, in comparison to the gold standard of change in weight, will be assessed by comparing the ratio of the change in dehydration score discharge minus baseline to the ratio change in weight discharge minus baseline for all subjects. A comparison will also be made between the ratio change in score and ratio change in weight using the measurements at follow-up. Lins concordance correlation coefficient will be estimated for both comparisons. This method of measuring correlation is preferred over Pearsons correlation coefficient, which is limited to estimating the degree of linearity between the two tests and not the accuracy. 