Medical statistician, understanding of rates and probabilities

On a short deadline, I am seeking a (medical) statistician who can advise on the use of event rates in a model comparing two treatments. Rate ratios are used to estimate differences in treatment effects for six variables, expressed as probabilities, and applied to estimate five year costs and effects. Due to data limitations, the event rates are taken by indirect comparison (three randomised trials).

The implications of using these calculations needs to be assessed by a trained statistician within 3 days.