st: stcox problem

[Simon Bach <sparkbach@gmail.com>]

Dear All
New to Stata so this may be very simple.
Running stcox: have generated a model to determine factors associated  
with recurrence of bowel cancer following surgery.
I isolated 3 tumour variables that are independently associated with  
recurrence (i.e. size, depth invasion, presence lymphatic invasion).
Two different types of surgery were performed (A and B). A is  
associated with much higher recurrence rates. This further improves  
the model.

In stcurve I can fix values for these variables and estimate the  
proportion of subjects who remain disease free at 60 months (eg 1cm  
diameter tumour, superficial invasion, no lymphatic invasion, excised  
using method A).
I can then generate estimates for other flavours of tumour (eg 2cm,  
3cm and so on).

BUT - I am struggling to obtain the corresponding raw figures for the  
proportion of patients who remain disease free at 60 months (using the  
different variable values)?

While I can read from the graph this is obviously clumsy/inaccurate.

Also stcurve does not appreciate stratified models, not a huge deal  
but predictably enough my model does fit better when stratified.

Can anybody please help?

BW
Simon Bach

(surgeon not statistician - unfortunately)


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