Table 1.

Characteristics of data points assembled for the trend analysis

Country	DHS survey(s) assessed	Number of data points from DHS		Survey years of World Bank data repository	Number of data points from World Bank data repository		Total number of data points
Benin	1996, 2001, 2006, 2011, 2017	5		1990–1995, 1997–2000, 2002–2005,	24		29
				2007–2010, 2012–2013, 2015–2016
				2017–2018
Burkina Faso	1993, 1998, 2003, 2010	4		1990–1992, 1994–1997, 1999–2002	25		29
				2004–2009, 2011–2018
Cote d’Ivoire	1994, 1998, 2011	3		1986–1993, 1995–1997, 1999–2010, 2012–2016	25		28
Gambia	2013	1		1990–2012, 2014–2016, 2018	28		29
Ghana	1988, 1993, 1998, 2003, 2008, 2014	6		1990–1992, 1994–1997, 1999–2002	23		29
				2004–2007, 2009–2013, 2015–2017
Guinea	1999, 2005, 2012, 2018	4		1990–1998, 2000–2004, 2006–2011	25		29
				2013–2017
Liberia	1986, 2007, 2013	3		1990–2006, 2008–2012, 2014–2016	25		28
Mali	1987, 1995, 2001, 2006, 2012, 2018	6		1990–1994, 1996–2000, 2002–2005	24		30
				2007–2011, 2013–2017
Mauritania	2001	1		1990–2000, 2002–2018	28		29
Niger	1992, 1998, 2006, 2012	4		1985–1991, 1993–1997, 1999–2005
				2007–2011, 2013–2018
Nigeria	1990, 1999, 2003, 2008, 2013, 2018	6		1991–1998, 2000–2007	22		28
				2009–2012, 2014–2016
Senegal	1986, 1992, 1997, 1999, 2005, 2010, 2012, 2014, 2015, 2016, 2017, 2018	12		1990–1991, 1993–1996, 2000–2004	18		30
				2006–2009, 2011, 2013, 2019
Sierra Leone	2008, 2013	2		1989–2007, 2009–2012, 2014–2019	28		30
Togo	1988, 1998, 2013	3		1990–1997, 1999–2012, 2014–2017	26		29
		60	14·8 %		346	85·2 %	406