A
selection of
prognostic factors
are available
for case-match survival estimation. The default selection in the drop-down
list for each factor is "All", which means that no selection has
been made for the specific factor.
The user can select any of the categories in the drop-down lists for one ore
more of the available variables.
Note that it is not
necessary to select categories for all variables.
By clicking the variable name an explanation of the current variable is
diplayed. A
variable selection guide
is included on the
website.
After completing the
selection process the calculate button is clicked. This starts a query to
the Finprog database
to retrieve
data on patients with a matching prognostic factor profile and known
outcome.
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A survival curve is calculated according to the
Kaplan-Meier product-limit method
on the server using the actual survival data of all matching patients.
A description of the
case-match system has
been published in:
BMJ 2003;326:29 (Full text )
BMJ 2003;326:2-3 (Editorial)
Note
that a second profile can also be added by clicking the blue triangle-arrow
 to the right of 'Profile1'.
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