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Re: st: Selecting subjects

From   Svend Juul <SJ@SOCI.AU.DK>
Subject   Re: st: Selecting subjects
Date   Thu, 13 Mar 2008 09:55:34 +0100

Ziad wrote:

I have cohort followed over 12 months. Time points have 2 variables:
   visit: coded after the number of weeks on treatmnet:
0,2,4,8,12,16,20,24,36 & 52 (patients expected to come on these weeks)
otherwise coded 999 if unexpected visit.
   week: showing the exact week number patient came to clinic.

I am trying to generate variable with value=1 to select patients who
came at all visits (mentioned above), with intention to identify
patients who did not come to the expected appointments.


I see three possible deviations from the expected:

1. The patient did not come to an expected appointment
2. An unexpected visit
3. The patient came to an expected appointment, but not at the right

It is not quite clear what you want; please be more specific. It would
help if you show a short example.



Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6
DK-8000  Aarhus C, Denmark
Phone:  +45 8942 6090
Home:   +45 8693 7796

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