absolute difference count difference A statistic that is a subtraction of one count from another. The term Count Difference is used to specify the Absolute Difference is with respect to a count or number of items (such as number of events, platelet counts, sample size e.g. number of people in the group) to distinguish from differences in other types of statistics (mean difference, median difference, risk difference, etc.) Expert Working Group Agreement: 2021-12-15 vote 6-0 by Robin Ann Yurk, Janice Tufte, Paola Rosati, Harold Lehmann, Joanne Dehnbostel, Muhammad Afzal Harold Lehmann, Brian S. Alper, Muhammad Afzal, Khalid Shahin, Philippe Rocca-Serra, Kenneth Wilkins, Joanne Dehnbostel, Janice Tufte COKA group