Rules on transfer of analysis results
The level of aggregation depends on a specific assessment of your material, and if you are in doubt whether 3 or in some cases 5 observations are enough to ensure anonymity, you should aggregate further.
https://www.dst.dk/en/TilSalg/data-til-forskning/regler-og-datasikkerhed/regler-for-hjemtagelse-af-analyseresultater