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. Author manuscript; available in PMC: 2017 Jul 26.
Published in final edited form as: Vaccine. 2015 Jan 16;33(10):1235–1242. doi: 10.1016/j.vaccine.2015.01.018

Fig. 3.

Fig. 3

iVDPV incidence by income level of country of case origin overtime. This figure demonstrates iVDPV incidence by income status of the country of origin. Income level of the country is designated according to 2012 GNI per capita, calculated using the World Bank Atlas method. The groups are stratified as follows: low income: $1035 or less; lower middle income, $1036–$4085; upper middle income, $4086–$12,615; and high income, $12,616 or more.