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Where the evidence sits, and where it does not. Studies flagged as conducted in Zambia, by the province named in the source and the programme domain.
no located study
thin → dense
An empty cell means no study whose source named that province, not
certainly no study. Roughly half of all records name no district or province at all,
which is why the unstated-geography row is the largest. Confirm from full text before
concluding that a province is unstudied.
Research was conducted in Zambia, and then nothing came back. registered studies with a Zambian site are recorded as completed or terminated on ClinicalTrials.gov with no results posted.
Ranked by enrolment, because the number of Zambians who took part is the measure of what was owed in return. Each links to its registry record. Some will have published in a journal without updating the registry; confirming which is the first task, and the residue is the dissemination gap the research agenda has to answer for.