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Re: st: pairwise comparison of a Survival data
From
"T. Alp Ozkan" <[email protected]>
To
[email protected]
Subject
Re: st: pairwise comparison of a Survival data
Date
Wed, 18 Apr 2012 08:30:11 +0300
Dear Listers,
Dealing with a this data set on survival analyses taught me a lot
however I stucked on this particular problem. Any opinion would be
great for me.
Thanks Alp
On Tue, Apr 17, 2012 at 1:43 PM, T. Alp Ozkan <[email protected]> wrote:
> Dear listers,
>
> I'm working on a data of renal carcinoma. In 2010 TNM cancer staging
> classification has been changed. According to this I want to validate
> new TNM classification. In a part of this analyse I need a pairwise
> survival comparisons of consecutive T stages (like T1avsT1b or T1b vs
> T2a)
>
> First I used stcox for TNM 2010 and test each other.
>
> . stcox i.pT2010
>
> failure _d: CSS
> analysis time _t: followuptimemonths
>
> No. of subjects = 1889 Number of obs = 1889
> No. of failures = 151
> Time at risk = 63708.43333
> LR chi2(6) = 144.47
> Log likelihood = -949.97419 Prob > chi2 = 0.0000
>
> ------------------------------------------------------------------------------
> _t | Haz. Ratio Std. Err. z P>|z| [95% Conf. Interval]
> -------------+----------------------------------------------------------------
> pT2010 |
> 11 | 2.879476 1.326301 2.30 0.022 1.16747 7.10201
> 21 | 5.796228 2.753477 3.70 0.000 2.284469 14.70638
> 22 | 10.66265 5.002194 5.04 0.000 4.251472 26.74184
> 30 | 14.05566 6.091828 6.10 0.000 6.010826 32.86763
> 31 | 48.52258 24.10974 7.81 0.000 18.32321 128.495
> 40 | 21.73121 9.848165 6.79 0.000 8.939966 52.82409
> ------------------------------------------------------------------------------
>
> . test 11.pT2010 21.pT2010
>
> ( 1) 11.pT2010 = 0
> ( 2) 21.pT2010 = 0
>
> chi2( 2) = 14.33
> Prob > chi2 = 0.0008
>
>
> As I read more help documents I realized another stratification with
> sts test variable, strata(subvariable) command.
>
> Would you help me to understand which one is suitable for this purpose?
>
> Thanks Alp
>
>
> . sts test pT2010, strata (T1bvsT2a)
>
> failure _d: CSS
> analysis time _t: followuptimemonths
>
>
> Stratified log-rank test for equality of survivor functions
>
> | Events Events
> pT2010 | observed expected(*)
> -------+-------------------------
> T1b | 22 28.29
> T2a | 17 10.71
> -------+-------------------------
> Total | 39 39.00
>
> (*) sum over calculations within T1bvsT2a
>
> chi2(1) = 5.16
> Pr>chi2 = 0.0231
>
> *
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*
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