Data that are subject to thresholds
Data that are subject to thresholds might be any of the dimensions Age, Gender, or Interest Category.
When a report contains any of these dimensions (for example, as a default dimension, a secondary dimension, or as part of an applied segment), then there is the possibility that thresholds have been enforced and not all of the original data appear in the report.
Thresholds are applied when the data might allow a recipient of the report to infer the characteristics (such as age, gender, or interests) of an individual user. Any rows below the threshold are not displayed. Rows above the threshold will contain complete data.
When these circumstances occur in a report, you see a notice below the report title.