Table 4.

Overview of aggregation schemes and the recommended median case count ranges and population thresholds (for a single year of data).

Aggregation scheme	Median case count range	Population threshold
Census tract	≥17.0 cases	Census tract*
Common outcome	7.3 to 16.9 cases	Total population 5000 persons
Rare outcome	1.9 to 7.2 cases	Total population 20,000 persons

^*Note: The census tract population threshold is based on the fact that census tracts are built with an average population of 4000 persons (with a wide range).