Number of psychiatric beds needed

Number needed to treat (NNT); number needed to harm (NNH).

Number Needed to Treat

Number Needed To… $ave?

The 'Number Needed to Treat' (NNT) is a useful measure for estimating the number of patients that would need to receive a therapeutic intervention to avoid one of the adverse events that the treatment is designed to prevent. We explored the possibility of an adaption of NNT to estimate the 'Number Needed to $ave' (NN$) as a new, conceptual systems metric to estimate potential cost-savings to th...

The Number of Reidemeister Moves Needed for Unknotting the Number of Reidemeister Moves Needed for Unknotting

There is a positive constant c 1 such that for any diagram D representing the unknot, there is a sequence of at most 2 c 1 n Reidemeister moves that will convert it to a trivial knot diagram, where n is the number of crossings in D. A similar result holds for elementary moves on a polyg-onal knot K embedded in the 1-skeleton of the interior of a compact, orientable, triangulated PL 3-manifold M...

Unknotting number and number of Reidemeister moves needed for unlinking

Article history: Received 25 April 2011 Received in revised form 11 January 2012 Accepted 11 January 2012