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Table 1 Classification of selected studies

From: Trends in the types and quality of childhood immunisations research output from Africa 1970–2010: mapping the evidence base

Categories Number of studies (%)
Clinical research 417
Clinical trials (Phases1-4) 168 (40%)
Burden or disease/epidemiology 100 (24%)
Other clinical studies 149 (36%)
Operational research 431
Programme management 332 (77%)
Policy 78 (18%)
Vaccine financing 21 (5%)