Table 1.

Evidence score of publications reviewed (see Beatty et al. (2011) [2])

Quality score	Description
I	Evaluation of important alternative interventions comparing all clinically-relevant outcomes against appropriate cost measures, and including a clinically-relevant sensitivity analysis
II	Evaluation of important alternative interventions comparing a limited number of outcomes against appropriate cost measurement, but including a clinically-sensible sensitivity analysis
III	Evaluation of important alternative interventions comparing all clinically-relevant outcomes against inappropriate cost measurement, but including a clinically-sensible sensitivity analysis
IV	Evaluation without a clinically-sensible sensitivity analysis
V	Expert opinion with no explicit critical appraisal, based on economic theory
UE	Ungraded evidence