[5][6][7][8][9][10] They provide local context to previous measures, allowing policy-makers to identify and prioritise the potential benefits of interventions on their own population.
[11][12] They are simple to compute, and contain the elements to which policy-makers would have to pay attention in the commissioning or improvement of services.
NEPP extends the well-known measure number needed to treat (NNT) beyond the individual patient to the population.
[citation needed] The formula for calculating the NEPP is where In order to reflect the incremental effect of changing from current to 'best' practice, and to adjust for levels of compliance, the proportion eligible for treatment, Pe, is
The basic formula to compute the PAR for dichotomous variables is where This is modified where there are multiple strata to: