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st: incidence rates


From   ipianah nic <ipianahnic@gmail.com>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: incidence rates
Date   Fri, 18 Feb 2011 10:50:07 +0000

Dear statalister

am investigating timeto peripheral neuropathy.I have stset my data as
stset time,fail(perntox==1) id(studyno) and included stptime,
per(1200)by (time)-where time is baseline,3,6,9 and 12 month and  i
have questionable  values for incidence rates as below.

time |  person-time   failures        rate             [95% Conf. Interval]
-----------+-----------------------------------------------------------
        3 |    2.9999999          1   33.333334     4.69545    236.6357
        6 |          210             35   16.666667    11.96656    23.21283
        9 |    81.000003          9   11.111111     5.781275    21.35459
       12 |         1860            8   .43010754     .2150958    .8600471
-----------+-----------------------------------------------------------
    total |         2154         53   2.4605386   1.879787    3.220711

have I missed anything in stsetting my data.

nic
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