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)
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
