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Table 1 Descriptive statistics of selected country-level variables

From: A bibliometric analysis of childhood immunization research productivity in Africa since the onset of the Expanded Program on Immunization in 1974

Variable Median Range
DTP3 coverage (%) 81.2 33.0 to 99.0
Gross domestic product (USD billions) 27.9 0.2 to 282.8
Adult literacy rate (%) 66.0 26.2 to 93.0
Physicians per 100,000 population 31.1 2.0 to 243.0
Total expenditure on health (% of GDP) 6.1 2.0 to 13.0
Private expenditure on health (% of GDP) 3.2 1.0 to 12.0
R&D expenditure (PPP, USD millions) 129.6 0.0 to 2494.0
Human development index 0.5 0.3 to 0.8
  1. DTP3, third dose of the diphtheria-tetanus-pertussis vaccine by one year of age; USD, United States Dollar; R&D, research and development; PPP, purchasing power parity