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Lee Sieswerda, Epidemiologist
Thunder Bay District Health Unit
999 Balmoral Street
Thunder Bay, Ontario
Canada  P7B 6E7
Tel: +1 (807) 625-5957
Fax: +1 (807) 623-2369
[email protected]
www.tbdhu.com



> -----Original Message-----
> From:	[email protected] [SMTP:[email protected]]
> Sent:	Monday, January 20, 2003 6:22 PM
> To:	[email protected]
> Subject:	st: Relative Risk Ratios
> 
> I am not sure if I have the syntax correct for running relative risk
> ratios. I do not have a strong background in epidemiology and am
> attempting to run Relative Risk Ratios (RRRs) for the first time. I have
> been doing some reading and the output I am getting while using Stata 7.0
> to run RRRs is not making sense.  I am looking at the risk of falling
> (continuous outcome) given various risk factors. I have included a few
> examples below assessing relative risk given the presence of a particular
> disease diagnosis for example.  I am getting huge confidence intervals and
> I am having difficulty determining the "p" or the actual significance in
> the output.   Can anyone out there help with the syntax and the output
> interpretation for RRRs?
> Thanks,
> Beth
> 
> . mlogit m179 fallrateall, rrr
> 
> Iteration 0:   log likelihood = -460.56789
> Iteration 1:   log likelihood = -460.41988
> Iteration 2:   log likelihood = -460.41932
> Iteration 3:   log likelihood = -460.41932
> 
> Multinomial regression                            Number of obs   =
> 1140
>                                                  LR chi2(1)      =
> 0.30
>                                                  Prob > chi2     =
> 0.5857
> Log likelihood = -460.41932                       Pseudo R2       =
> 0.0003
> 
> --------------------------------------------------------------------------
> ----
>        m179 |        RRR   Std. Err.      z    P>|z|     [95%Conf.
> Interval]
> -------------+------------------------------------------------------------
> ----
> 1            |
> fallrateall |    8.05732   30.29487     0.55   0.579     .0050786
> 12783.19
> --------------------------------------------------------------------------
> ----
> (Outcome m179==0 is the comparison group)
> 
> . mlogit m180 fallrateall, rrr 
> 
> Iteration 0:   log likelihood = -357.23299
> Iteration 1:   log likelihood =  -357.0605
> Iteration 2:   log likelihood = -357.05925
> Iteration 3:   log likelihood = -357.05925
> 
> Multinomial regression                            Number of obs   =
> 1140
>                                                  LR chi2(1)      =
> 0.35
>                                                  Prob > chi2     =
> 0.5555
> Log likelihood = -357.05925                       Pseudo R2       =
> 0.0005
> 
> --------------------------------------------------------------------------
> ----
>        m180 |        RRR   Std. Err.      z    P>|z|     [95% Conf.
> Interval]
> -------------+------------------------------------------------------------
> ----
> 1            |
> fallrateall |   .0529155   .2718481    -0.57   0.567     2.24e-06
> 1248.945
> --------------------------------------------------------------------------
> ----
> (Outcome m180==0 is the comparison group)
> 
> .  mlogit m181 fallrateall, rrr 
> 
> Iteration 0:   log likelihood = -574.59306
> Iteration 1:   log likelihood = -573.42724
> Iteration 2:   log likelihood = -573.40905
> Iteration 3:   log likelihood = -573.40905
> 
> Multinomial regression                            Number of obs   =
> 1140
>                                                  LR chi2(1)      =
> 2.37
>                                                  Prob > chi2     =
> 0.1238
> Log likelihood = -573.40905                       Pseudo R2       =
> 0.0021
> 
> --------------------------------------------------------------------------
> ----
>        m181 |        RRR   Std. Err.      z    P>|z|     [95% Conf.
> Interval]
> -------------+------------------------------------------------------------
> ----
> 1            |
> fallrateall |   .0031174   .0122738    -1.47   0.143     1.39e-06
> 7.000684
> --------------------------------------------------------------------------
> ----
> (Outcome m181==0 is the comparison group)
> 
> 
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