The role of chance

If this trial was repeated in another group of 10 similar patients, would you expect to see exactly the same results again? Would it be surprising if, for example, 1 patient in each group had a heart attack? Would it be surprising if 2 patients in the placebo group and 3 patients in the treatment group had a heart attack?

Try changing the values in the table and look at the effect on the relative risk reduction.

Select the values from the drop down lists in the table below.

No. of patients No. of patients with heart attacks Relative risk reduction
Drug A 10


Placebo 10