An easier database to use is the Dansk Demografisk Database. It is not nearly as complete, however, as the database you've been trying to search.
Lar's sister Caroline in 1880 as a patient in a hospital.
København, København (Staden), Blegdamsvej, Hospitalet, , , FT-1880, C8599
Caroline Bolette Køhler 19 Ugift (unmarried) Patient, Tjenestepige (working girl/servant) born in Rørvig Sogn
...Many more persons are enumerated at this hospital.