Sampling 56 was used to account for possible variations in input parameters. Preliminary analyses comparing the uncertainty results for 1,000 and 10,000 simulations indicated a difference of less than 2% in median results for the general case and the first country (i.e., Albania) uncertainty distributions. As a result, 1,000 simulations were conducted for each system scenario and country combination (i.e., 462 combinations with 6 system scenarios and 77 countries). Result distributions for daily per capita cost and annual per capita CI were calculated by incorporating 10-50% uncertainty for all input parameters based on the level of confidence in the specific parameter values and to account for variability due to factors such as spatial heterogeneity of material prices and impacts (Tables ) .