In research samples, how much of a change in scale scores should be considered a “real” change?

Answer: In research designed to compare the effects of different interventions with each other or with no interventions, changes can be tested as follows: Scores for groups of older adults receiving the different conditions should be statistically analyzed to see whether there are (a) significant changes from pre-intervention to post-intervention and (b) whether there are significant group differences in changes. Statistical analyses of group data thus provide a basis for determining whether changes are “real” according to statistical criteria for chance vs. non chance changes in the samples that were assessed.

Comments are closed