[EpiData-list] hidden values, but aggregate counts?

First, my thanks to Dirk for answering an earlier query of mine. Please forgive another question.

For each record, I calculate a value at the bottom of the data entry form and determine if the respondent fits in group 1 or group 2. Is there any way to hide this group designation for the individual record (as in the value cannot be seen in the form), but still count the aggregate number of respondents fitting into group 1 or group 2?

I consider using a temporary variable as a counter, but this raises complications if records are entered in separate batches or earlier records have their values modified.

Thanks!

Anthony