Sounds like a good guess to me. It was a result that fell out of the
data and not something they were looking for as part of the study design.
Chuck Norcutt
usher99@xxxxxxx wrote:
> Sounds like you are making excellent progress. Great.
>
> Piers likely hit the nail on the head. Given the large N, it is very
> very likely an observational study confounded by selection bias.
> Very difficult to really adjust for all confounders in that situation.
> I doubt a randomized trial would ever be done, however.
> Mike
>
>
>
> ps: for reasons not understood, people who have bilateral replacment
> tend to live longer and by a statistically significant margin.
>
> Chuck Norcutt
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