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Data Summaries and Graphing: Question on 1.1 Case study: using stents to prevent strokes
saiviki Jul 28, 2016 ReplyFlag
The effect of stents are checked at two time points: 30 days after enrollment and 365 days after enrollment.

I want to know why the effect of stents is not checked at 0 - 30 days and 30 - 365 days.

And does the choice of the question has to do anything regarding these two check points?

Thanks in advance.
David Jul 29, 2016 ReplyFlag
It was an arbitrary decision. We could have discussed the 365 day time point instead.

> And does the choice of the question has to do
> anything regarding these two check points?
I'm not quite sure what you are asking here. Could you clarify?
saiviki Aug 08, 2016 ReplyFlag
The principal question taken by the researchers is "Does the use of stent reduce the risk of stroke?".

Is the effect of stents checked at the two time intervals(30 days after enrolment and 365 days after enrolment) because of the way the principal question is chosen.

If I consider the time periods 0-30 days and 30-365 days, the number of patients who had stroke in Treatment and Control group is 15(30-365 days group).

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