| Income group | Top 30 countries | Estimated MDR-TB cases among notified TB cases | Notified MDR-TB cases | |||||||||
| Countries n | % of countries by income group | n# | % of cases by country income group | n | % of cases by country income group | |||||||
| Low | 9 | 30 | 30 | 30 | 26 600 | 10 | 10 | 10 | 3161 | 4 | 4 | 4 |
| Lower middle | 10 | 33 | 63 | 70 | 114 900 | 42 | 73 | 90 | 29 291 | 38 | 77 | 96 |
| Upper middle | 9 | 30 | 86 500 | 31 | 30 680 | 39 | ||||||
| High: non-OECD | 1 | 3 | 7 | 46 000 | 17 | 17 | 13 612 | 17 | 19 | |||
| High: OECD | 1 | 3 | 2200 | 1 | 1212 | 2 | ||||||
| Total | 30 | 280 000 | 77 956 | |||||||||
Income groupings as per World Bank 2013 (discussed further in [17]). OECD: Organisation for Economic Co-operation and Development.#: rounded to two significant figures.