Anonymisation of data sets from Helsana
At a glance
- Project leader : Dr. Matthias Templ
- Project team : Prof. Dr. Andreas Ruckstuhl
- Project budget : CHF 40'690
- Project status : completed
- Funding partner : Third party (Helsana Gesundheitswissenschaften)
- Project partner : Helsana Gesundheitswissenschaften
- Contact person : Matthias Templ
Description
For sharing of confidential data as well as for the internal use
of data anonymization is required, so that the conclusion on
individuals is prevented and the analysis quality of the data is
retained as far as possible. Data anonymization is applied to
Helsana's complex data sets.
Data in general but also data of Helsana Health Sciences used in
analyzes internally and externally for far-reaching analyzes.
Typically such kind of analyzes is often done for which the
data were originally not intended at all or for which they were not
collected.
Quite centrally and in all respects the personal reference is the
essential criterion when deciding on appropriate data transfer and
data anonymization. Data without personal reference are excluded
from the data protection laws and therefore one tries with
anonymization to eliminate the personal reference.
Such anonymization is by no means adequately fulfilled by perfect
IT security and deletion or pseudo-anonymization of direct
identification variables, such as name of the insured and AHV
number, as soon as data is passed on internally or externally.
Legislation has been explicitly stating for about two decades that
the deletion of direct identification variables (or
pseudo-anonymization of them) is by no means sufficient for
person-specific data.
First and foremost, the re-identification risk must be determined
using probabilistic approaches. The decisive factor is the
application of anonymization methods so that two goals are achieved
at the same time: to decisively reduce the re-identification risk
of persons and not to impair the data analysis quality of the
data.
The data contain billing information, information about the service
deliveries and individual data insured as well as highly sensitive
information.