Number of one-year-olds who are not fully vaccinated against in Tonga
Tonga: Number of one-year-olds who are not fully vaccinated against was 23.98 one-year-olds in 2023. ◆ Volatile
Number of one-year-olds who are not fully vaccinated against diphtheria, pertussis and tetanus in Tonga, 1980–2023
Source: WHO & UNICEF (2026); UN, World Population Prospects (2024) – processed by Our World in Data. Measured in one-year-olds.
Analysis
The most recent figure for number of one-year-olds who are not fully vaccinated against diphtheria, pertussis and tetanus in Tonga is 23.98 one-year-olds, measured in 2023.
That represents a change of up 0.6% on the previous year and down 13.8% over ten years.
Over the whole period, number of one-year-olds who are not fully vaccinated against diphtheria, pertussis and tetanus in Tonga peaked at 1,910 one-year-olds in 1981 and was at its lowest, 23.6 one-year-olds, in 2021.
That places Tonga 188th out of 195 countries with data for 2023, putting it in the bottom quarter.
The series is highly variable year to year, so single readings are best treated with caution.
Number of one-year-olds who are not fully vaccinated against in Tonga, year by year
| Year | one-year-olds | Change |
|---|---|---|
| 1980 | 1,840 one-year-olds | — |
| 1981 | 1,910 one-year-olds | +3.8% |
| 1982 | 1,445 one-year-olds | -24.3% |
| 1983 | 1,112 one-year-olds | -23.0% |
| 1984 | 1,477 one-year-olds | +32.8% |
| 1985 | 243.04 one-year-olds | -83.5% |
| 1986 | 768.25 one-year-olds | +216.1% |
| 1987 | 30.85 one-year-olds | -96.0% |
| 1988 | 245.36 one-year-olds | +695.3% |
| 1989 | 210.84 one-year-olds | -14.1% |
| 1990 | 175.86 one-year-olds | -16.6% |
| 1991 | 344.64 one-year-olds | +96.0% |
| 1992 | 28.44 one-year-olds | -91.7% |
| 1993 | 113.48 one-year-olds | +299.0% |
| 1994 | 312.51 one-year-olds | +175.4% |
| 1995 | 143.4 one-year-olds | -54.1% |
| 1996 | 28.94 one-year-olds | -79.8% |
| 1997 | 114.92 one-year-olds | +297.1% |
| 1998 | 85.8 one-year-olds | -25.3% |
| 1999 | 171.96 one-year-olds | +100.4% |
| 2000 | 143.25 one-year-olds | -16.7% |
| 2001 | 173.04 one-year-olds | +20.8% |
| 2002 | 289 one-year-olds | +67.0% |
| 2003 | 57.88 one-year-olds | -80.0% |
| 2004 | 29.29 one-year-olds | -49.4% |
| 2005 | 29.59 one-year-olds | +1.0% |
| 2006 | 29.65 one-year-olds | +0.2% |
| 2007 | 29.5 one-year-olds | -0.5% |
| 2008 | 29.19 one-year-olds | -1.1% |
| 2009 | 28.64 one-year-olds | -1.9% |
| 2010 | 28.33 one-year-olds | -1.1% |
| 2011 | 29.21 one-year-olds | +3.1% |
| 2012 | 145.1 one-year-olds | +396.7% |
| 2013 | 27.83 one-year-olds | -80.8% |
| 2014 | 54.76 one-year-olds | +96.8% |
| 2015 | 108.64 one-year-olds | +98.4% |
| 2016 | 107.68 one-year-olds | -0.9% |
| 2017 | 25.99 one-year-olds | -75.9% |
| 2018 | 24.98 one-year-olds | -3.9% |
| 2019 | 24.33 one-year-olds | -2.6% |
| 2020 | 23.81 one-year-olds | -2.1% |
| 2021 | 23.6 one-year-olds | -0.9% |
| 2022 | 23.84 one-year-olds | +1.0% |
| 2023 | 23.98 one-year-olds | +0.6% |
Tonga compared with similar countries
- Tonga's 23.98 one-year-olds is below the median for upper middle income countries, which is 4,976 one-year-olds, 0% of the median. (58 countries reporting)
- Tonga's 23.98 one-year-olds is below the median for East Asia & Pacific, which is 4,252 one-year-olds, 1% of the median. (30 countries reporting)
Biggest year-on-year movements
Years where Number of one-year-olds who are not fully vaccinated against in Tonga changed far more than this series normally does. A large move can be a real event or a change in how the figure was measured — the source note below says who published it.
| Year | Change | From | To |
|---|---|---|---|
| 1988 | +695.3% | 30.85 one-year-olds | 245.36 one-year-olds |
| 2012 | +396.7% | 29.21 one-year-olds | 145.1 one-year-olds |
| 1993 | +299.0% | 28.44 one-year-olds | 113.48 one-year-olds |
| 1997 | +297.1% | 28.94 one-year-olds | 114.92 one-year-olds |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | 928.24 one-year-olds | 30.85 one-year-olds | 1,910 one-year-olds | 10 |
| 1990s | 152 one-year-olds | 28.44 one-year-olds | 344.64 one-year-olds | 10 |
| 2000s | 83.9 one-year-olds | 28.64 one-year-olds | 289 one-year-olds | 10 |
| 2010s | 57.69 one-year-olds | 24.33 one-year-olds | 145.1 one-year-olds | 10 |
| 2020s | 23.81 one-year-olds | 23.6 one-year-olds | 23.98 one-year-olds | 4 |
Countries ranked near Tonga
- 185 Nauru 46.35 one-year-olds compare
- 186 Antigua and Barbuda 33.27 one-year-olds compare
- 187 Cook Islands 26.32 one-year-olds compare
- 189 Saint Kitts and Nevis 22.36 one-year-olds compare
- 190 San Marino 19.89 one-year-olds compare
- 191 Tuvalu 13.14 one-year-olds compare
More health data for Tonga
- Un projection of annual infant deaths, annual growth rate -33.33 % change on previous year (2100)
- Heat deaths vs projected death rates, annual growth rate 2.33 % change on previous year (2090)
- Number of infants who die before age 1 2 deaths (2100)
- Neonatal tetanus - number of reported cases, gaps filled 0 (2025)
- Population ages 00-04, female, annual growth rate -1.42 % change on previous year (2025)
- Population ages 00-04, female, per unit of GDP 0 units per US$ of GDP (2025)
- Population ages 00-04, female, per capita 0.0535 units per person (2025)
- Population ages 00-04, male, annual growth rate -1.36 % change on previous year (2025)
- Population ages 00-04, male, per unit of GDP 0 units per US$ of GDP (2025)
- Population ages 00-04, male, per capita 0.0578 units per person (2025)
Frequently asked questions
- What is number of one-year-olds who are not fully vaccinated against diphtheria, pertussis and tetanus in Tonga?
- Number of one-year-olds who are not fully vaccinated against diphtheria, pertussis and tetanus in Tonga was 23.98 one-year-olds in 2023, according to WHO & UNICEF (2026); UN, World Population Prospects (2024) – processed by Our World in Data.
- What is the highest number of one-year-olds who are not fully vaccinated against diphtheria, pertussis and tetanus recorded in Tonga?
- The highest recorded value was 1,910 one-year-olds in 1981.
- What is the lowest number of one-year-olds who are not fully vaccinated against diphtheria, pertussis and tetanus recorded in Tonga?
- The lowest recorded value was 23.6 one-year-olds in 2021.
- How does Tonga rank for number of one-year-olds who are not fully vaccinated against diphtheria, pertussis and tetanus?
- Tonga ranks 188th out of 195 countries with data for 2023.
- Is number of one-year-olds who are not fully vaccinated against diphtheria, pertussis and tetanus rising or falling in Tonga?
- Over the last ten years it is down 13.8%. The long-run trend across the full record is volatile.
- Where does this Tonga data come from?
- The figures come from WHO & UNICEF (2026); UN, World Population Prospects (2024) – processed by Our World in Data, published as part of Number of one-year-olds who are not fully vaccinated against diphtheria, pertussis and tetanus. Statizoid updates them automatically from the source API.
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About this data
Number of one-year-olds who have not had three doses of the combined diphtheria, tetanus and pertussis vaccine in a given year.