We’ve posted a new version of the Group file in a format that is easier to review: Loinc 2.63 Groupfile Alpha 2 grouped with counts (Requires a free loinc.org login)
The spreadsheet contains counts by both ParentGroup and Group, and you can expand and collapse at both levels to quickly find what you are looking for.
We would really appreciate your feedback, including comments about existing groups, new groups you would like to see added, and information about how you are using or planning to use the file.
Note: Do not import this version of the spreadsheet into your database because the count rows will also get imported. The original format is better for importing.