Table 3 Quality assessment: Percentage of the cost studies compliant with GHCC Reference Case^a

Quality assessment of cost studies (N = 65) following the GHCC principles in %

Reported cost estimated by testing modality

Study purpose and population (P1)

Study perspective and types of costing approach used (P2-3)

Unit cost, time horizon, scope, the quantity of inputs, sampling, and data source strategy (P4-9)

Timing of data collection sources for price data (P10-11)

Annualisation or depreciation of capital cost and discounting (P12-13)

Shadow prices for goods and for the opportunity cost of time (P14)

Characterising heterogeneity (P15)

Characterising uncertainty (P16)

Communicated limitations, conflicts of interest (P17)