Country | Earliest Survey | Latest Survey | Observation timea |
---|---|---|---|
Western Africa (n = 12) | |||
Benin | 1996 | 2011–2012 | 16 |
Burkina Faso | 1993 | 2010 | 17 |
Cote d’Ivoire | 1994 | 2011–12 | 18 |
Ghana | 1993 | 2014 | 21 |
Guinea | 1999 | 2012 | 13 |
Liberia | 2007 | 2013 | 6 |
Mali | 1995–96 | 2012–13 | 17 |
Niger | 1998 | 2012 | 14 |
Nigeria | 1990 | 2013 | 23 |
Senegal | 1997 | 2014 | 17 |
Sierra Leone | 2008 | 2013 | 5 |
Togo | 1998 | 2013–14 | 16 |
Middle Africa (n = 4) | |||
Cameroon | 1991 | 2011 | 20 |
Congo (Brazzaville) | 2005 | 2011–12 | 7 |
Congo Democratic Republic | 2007 | 2013–14 | 7 |
Gabon | 2000 | 2012 | 12 |
Eastern Africa (n = 11) | |||
Comoros | 1996 | 2012 | 16 |
Ethiopia | 2000 | 2011 | 11 |
Kenya | 1993 | 2014 | 21 |
Madagascar | 1997 | 2008–09 | 12 |
Malawi | 1992 | 2010 | 18 |
Mozambique | 1997 | 2011 | 14 |
Rwanda | 1992 | 2010 | 18 |
Tanzania | 1996 | 2010 | 14 |
Uganda | 1995 | 2011 | 16 |
Zambia | 1996 | 2013–14 | 18 |
Zimbabwe | 1994 | 2010–2011 | 17 |
Southern Africa (n = 2) | |||
Lesotho | 2004 | 2014 | 10 |
Namibia | 1992 | 2013 | 21 |
Summary statistics | |||
Minimum observation time (years) | 5 | ||
Maximum observation time (years) | 23 | ||
Mean observation time (years) | 15 | ||
Standard deviation | 4.7 | ||
Lower and upper quartiles (years) |