Table 1.
Descriptive statistics of selected country-level variables
| 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 |
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