A DATA SET is defined as a collection of data summaries and analyses that are derived from a single, defined group of subjects. The specifications used for defining any given Data Set are stated on the corresponding Data Set page, which also states the total number of patients providing data for that Data Set (the "Overall Sample Number.")
In many of the Archive data summaries, the actual number of cases available for analysis is smaller than the "Overall Sample Number" for that Data Set, because not all questions or data items received responses from every patient in the sample. Therefore, in every data summary there is an explicit statement at the top showing the number of patients responding to the question or item under discussion.
Oregon Health & Science University. All rights reserved. Tinnitus Archive, second
edition. Website published by the Oregon Hearing Research Center.