Japan vs Sierra Leone: Share of one-year-olds vaccinated against diphtheria, tetanus
Japan
91.0%
in 2025
Sierra Leone
91.0%
in 2025
Japan rank
93rd
Sierra Leone rank
93rd
Share of one-year-olds vaccinated against diphtheria, tetanus over time
- Japan
- Sierra Leone
How they compare
Japan currently reports 91.0% against 91.0% in Sierra Leone, a difference of 0.0%.
The two have swapped places 1 time across 27 shared years of data; in 1999 it was Japan ahead.
Japan ranks 93rd and Sierra Leone ranks 93rd of 195 countries.
Japan has averaged higher in every one of the 4 decades both report.
Head to head by decade
| Decade | Japan | Sierra Leone | Difference | Ahead |
|---|---|---|---|---|
| 1990s | 80.0% | 43.0% | 37.0% | Japan |
| 2000s | 96.1% | 62.7% | 33.4% | Japan |
| 2010s | 97.3% | 88.9% | 8.4% | Japan |
| 2020s | 97.0% | 91.2% | 5.8% | Japan |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher share of one-year-olds vaccinated against diphtheria, tetanus and pertussis, Japan or Sierra Leone?
- Japan, at 91.0% against 91.0% in Sierra Leone as of 2025.
- What is the difference in share of one-year-olds vaccinated against diphtheria, tetanus and pertussis between Japan and Sierra Leone?
- 0.0%, with Japan ahead.
- How many years of comparable data are there for Japan and Sierra Leone?
- 27 years are reported by both, from 1999 to 2025.
- How do Japan and Sierra Leone rank globally for share of one-year-olds vaccinated against diphtheria, tetanus and pertussis?
- Japan ranks 93rd and Sierra Leone ranks 93rd of 195 countries.
- Where does this data come from?
- WHO & UNICEF (2026); UN, World Population Prospects (2024) – processed by Our World in Data, published as Share of one-year-olds vaccinated against diphtheria, tetanus and pertussis. Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
Share of one-year-olds who have had three doses of the combined diphtheria, tetanus and pertussis vaccine in a given year.