This reduces to MRv - MRc = ARRI/(0.90-0.43) . Where "ARRI" is the ARR from the ITT analysis. However you do the math, you end up inflating the ARRI by a factor of 1/0.47 , which reduces the NNT, so the adjusted NNT = NNTI * (0.47). 100 * 0.47 = 47. The 49 that some of us are getting is because we used Excel which doesn't round 3/1039 to 0.003 (it's 0.00288739) or 10/1039 to 0.01 (it's 0.00962454). This is not OCD; it's actually easier to do these kinds of calculation in Excel.
MAK