Based on input from BearDownAZ and fouremm here,... all numbers very approximate and not in any way backed by science:

https://agoracom.com/ir/Resverlogix/forums/discussion/topics/727764-why-didn-t-management-do-some-phase-2-s/messages/2233904#message

Patient years = 5300

Minus Drop out Rate 20% (should be 25% but I figure about 5% was used before dropping out)

= 5300 * .80 = 4240 Net Patient Years

Placebo Event Rate = 7%, so half the patient years (for placebo group)

2120 * 7% = 148 events in placeo group 

Therefore 250 - 148 = 102 events in treated group

Therefore approximate %31 RRR

Go easy on my calculations,... I recently had a stroke,... my brain's not working 100% just yet.