Table 1.
Country-years and number of observations by country income classification. Numbers in parentheses represent the number of studies from that country in that particular year.
| High Income (n = 65) | ||
| Country | # of Studies | Years of Treatment Data |
| Australia | 1 | 1994 |
| Belgium | 1 | 1992 |
| Canada | 5 | 1992, 1995, 2002, 2009(2) |
| Czech Republic | 1 | 2008 |
| Denmark | 3 | 1992, 1998, 2004 |
| Finland | 4 | 1992(3), 2005 |
| France | 2 | 1998, 2006 |
| Germany | 6 | 1992, 1995(3), 2001(2) |
| Greece | 6 | 1997, 1998, 2001(2), 2002, 2004 |
| Italy | 2 | 1994(2) |
| Japan | 1 | 1995 |
| Korea, Rep. | 2 | 2001(2) |
| Kuwait | 1 | 2008 |
| Netherlands | 3 | 2003, 2004(2) |
| New Zealand | 1 | 1994 |
| Portugal | 2 | 2003(2) |
| Saudi Arabia | 1 | 2005 |
| Spain | 3 | 1990, 1996, 2004 |
| Sweden | 3 | 1994, 1996 |
| Switzerland | 1 | 1993 |
| United Kingdom | 8 | 1995, 1998(2), 2003(4), 2006, |
| United States of America | 7 | 1990, 1994, 2000(2), 2003, 2004, 2005 |
| United Arab Emirates | 1 | 2009 |
| Upper Middle Income (n = 26) | ||
| Country | # of Studies | Years of Treatment Data |
| Argentina | 1 | 2009 |
| Barbados | 1 | 1996 |
| Botswana | 1 | 2007 |
| Brazil | 1 | 2009 |
| Chile | 3 | 2004(2) |
| China | 1 | 2010 |
| Colombia | 1 | 2009 |
| Czech Republic | 3 | 2001(3) |
| Gabon | 1 | 2003 |
| Iran, Islamic Rep. | 1 | 2009 |
| Korea, Rep. | 1 | 2000 |
| Lebanon | 1 | 2008 |
| Malaysia | 4 | 1996(2), 2004 |
| Mexico | 3 | 1993, 2000, 2002 |
| Romania | 1 | 2005 |
| St. Lucia | 1 | 1996 |
| Turkey | 1 | 2009 |
| Lower Middle Income (n = 30) | ||
| Country | # of Studies | Years of Treatment Data |
| China | 8 | 1999, 2001(4), 2002(2), 2009 |
| Egypt, Arab Rep. | 1 | 2005 |
| Fiji | 1 | 2002 |
| Iran, Islamic Rep. | 1 | 2005 |
| Iraq | 2 | 2003, 2006 |
| Maldives | 1 | 2004 |
| Mongolia | 1 | 2009 |
| Russian Federation | 2 | 2005(2) |
| Thailand | 2 | 2003, 2004 |
| Tunisia | 1 | 2001 |
| Turkey | 4 | 1995, 1999, 2003(2) |
| Venezuela, RB | 1 | 1996 |
| India | 3 | 2007(2), 2009 |
| Pakistan | 1 | 2009 |
| Micronesia | 1 | 2002 |
| Low Income (n = 33) | ||
| Country | # of Studies | Years of Treatment Data |
| Bangladesh | 1 | 2009 |
| Benin | 1 | 2007 |
| Cambodia | 1 | 2010 |
| Cameroon | 1 | 2004 |
| China | 3 | 1993, 1994, 1998 |
| Egypt, Arab Rep. | 1 | 1991 |
| Eritrea | 1 | 2004 |
| Ghana | 5 | 2001, 2002, 2004(3) |
| India | 6 | 1999, 2000, 2002(2), 2004, 2005 |
| Lao PDR | 1 | 2008 |
| Madagascar | 1 | 2005 |
| Malawi | 1 | 2009 |
| Mauritania | 1 | 2007 |
| Mongolia | 1 | 2006 |
| Mozambique | 1 | 2005 |
| Nepal | 2 | 2003, 2005 |
| Nigeria | 1 | 2003 |
| Sierra Leone | 1 | 2009 |
| Solomon Islands | 1 | 2006 |
| Vietnam | 1 | 2008 |
| Zambia | 1 | 2008 |