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Table 3 Distribution of the global population as of 2013 [33] in hundreds of millions by World Bank income level [34] and polio vaccine use as of October 2012 [16] covering 200 countries with available data (i.e., 99.7 % of the global population) with numbers in parentheses indicating the number of corresponding epidemiological blocks in the global model

From: An economic analysis of poliovirus risk management policy options for 2013–2052

Income level Polio vaccine use at T0 Total blocks
Unknown OPV-only IPV/OPV IPV-only
Unknown 0.233 (0) 0 (0) 0 0 0
LOW 0 (0) 8.46 (8) 0 0 9
LMI 0 (0) 24.2 (25) 0.67 (0) 0 25
UMI 0 (0) 18.7 (19) 5.31 (7) 0.39 (0) 25
HIGH 0 (0) 0.28 (0) 2.32 (2) 10.21 (10) 12
Total blocks 0 52 9 10 71
  1. Abbreviations: HIGH, high-income; IPV, inactivated poliovirus vaccine; LMI, lower middle-income; LOW, low-income; OPV, oral poliovirus vaccine; T0, beginning of analytical time horizon (i.e., January 1, 2013); UMI, upper middle-income