Broadly there are three types of studies: - large data sets that have collected information on variables that are seen as determinants or important associated factors to nutritional status (e.g. NDHS),
- studies that have re-analysed large data sets such as the NDHS (e.g. Ajieroh, 2009, Omilola (2010) Agee, 2010 (with the 2003 data set) and Adekanmbi et al 2011 (with the 2008 data set), and
- self standing village- or clinic-based studies.
All will have varying degrees of relevance to the five Programme states: some may provide data from those very states, others from similar agro-ecological zones.