Summary of the quantity of evidence and the trajectory of 14 PHC systems (2010 to 2017); red = low evidence (0 to 6 articles), yellow = moderate evidence (7 to 13 articles), green = high evidence (14+ articles)
| Country | Evidence base | Trajectory of PHC system since 2010 |
| Afghanistan | Moderate – 12 | Improving |
| Bolivia | Low - 4 | Indeterminate |
| Brazil | High - 43 | Improving |
| Costa Rica | Low – 3 | Stable to improving |
| Cuba | Low – 1 | Indeterminate |
| Gambia | Low - 2 | Indeterminate |
| Ghana | High - 14 | Improving |
| Iran | Moderate - 11 | Stable |
| Kerala | Low - 2 | Indeterminate |
| Liberia | Low - 3 | Stable to improving |
| Mexico | Moderate - 10 | Stable to improving |
| Niger | Low - 3 | Indeterminate |
| Sri Lanka | Low - 5 | Stable to improving |
| Thailand | High - 15 | Stable to improving |
PHC, primary healthcare.