Number of one-year-olds who are not vaccinated against polio in Sao Tome and Principe
Sao Tome and Principe: Number of one-year-olds who are not vaccinated against polio was 937.65 one-year-olds in 2023. ◆ Volatile
Latest (2023)
937.65 one-year-olds
Change on year
up 39.4%
World rank
149th
of 194 countries
All-time high
1,997 one-year-olds
in 1985
All-time low
55.08 one-year-olds
in 2004
Years of data
43
1981–2023
Number of one-year-olds who are not vaccinated against polio in Sao Tome and Principe, 1981–2023
Source: WHO & UNICEF (2025); UN, World Population Prospects (2024) – processed by Our World in Data. Measured in one-year-olds.
Analysis
Sao Tome and Principe recorded 937.65 one-year-olds for number of one-year-olds who are not vaccinated against polio in 2023.
The figure is up 39.4% on the previous year and up 413.4% over ten years.
Over the whole period, number of one-year-olds who are not vaccinated against polio in Sao Tome and Principe peaked at 1,997 one-year-olds in 1985 and was at its lowest, 55.08 one-year-olds, in 2004.
Sao Tome and Principe ranks 149th of 194 countries on this measure, 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 vaccinated against polio in Sao Tome and Principe, year by year
| Year | one-year-olds | Change |
|---|---|---|
| 1981 | 1,878 one-year-olds | — |
| 1982 | 1,905 one-year-olds | +1.4% |
| 1983 | 1,930 one-year-olds | +1.3% |
| 1984 | 1,960 one-year-olds | +1.6% |
| 1985 | 1,997 one-year-olds | +1.9% |
| 1986 | 1,335 one-year-olds | -33.2% |
| 1987 | 1,128 one-year-olds | -15.5% |
| 1988 | 1,161 one-year-olds | +3.0% |
| 1989 | 1,620 one-year-olds | +39.5% |
| 1990 | 437 one-year-olds | -73.0% |
| 1991 | 577.59 one-year-olds | +32.2% |
| 1992 | 1,491 one-year-olds | +158.2% |
| 1993 | 1,832 one-year-olds | +22.8% |
| 1994 | 1,420 one-year-olds | -22.5% |
| 1995 | 958.86 one-year-olds | -32.5% |
| 1996 | 1,458 one-year-olds | +52.0% |
| 1997 | 1,230 one-year-olds | -15.6% |
| 1998 | 1,270 one-year-olds | +3.3% |
| 1999 | 901 one-year-olds | -29.1% |
| 2000 | 581.88 one-year-olds | -35.4% |
| 2001 | 450.6 one-year-olds | -22.6% |
| 2002 | 396 one-year-olds | -12.1% |
| 2003 | 324.84 one-year-olds | -18.0% |
| 2004 | 55.08 one-year-olds | -83.0% |
| 2005 | 167.55 one-year-olds | +204.2% |
| 2006 | 170.64 one-year-olds | +1.8% |
| 2007 | 116.14 one-year-olds | -31.9% |
| 2008 | 59.16 one-year-olds | -49.1% |
| 2009 | 59.76 one-year-olds | +1.0% |
| 2010 | 119.36 one-year-olds | +99.7% |
| 2011 | 235.64 one-year-olds | +97.4% |
| 2012 | 232.24 one-year-olds | -1.4% |
| 2013 | 182.64 one-year-olds | -21.4% |
| 2014 | 318.7 one-year-olds | +74.5% |
| 2015 | 252.52 one-year-olds | -20.8% |
| 2016 | 248.76 one-year-olds | -1.5% |
| 2017 | 304.5 one-year-olds | +22.4% |
| 2018 | 297.95 one-year-olds | -2.2% |
| 2019 | 293.9 one-year-olds | -1.4% |
| 2020 | 357.6 one-year-olds | +21.7% |
| 2021 | 423.5 one-year-olds | +18.4% |
| 2022 | 672.87 one-year-olds | +58.9% |
| 2023 | 937.65 one-year-olds | +39.4% |
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1980s | 1,657 one-year-olds | 1,128 one-year-olds | 1,997 one-year-olds | 9 |
| 1990s | 1,158 one-year-olds | 437 one-year-olds | 1,832 one-year-olds | 10 |
| 2000s | 238.17 one-year-olds | 55.08 one-year-olds | 581.88 one-year-olds | 10 |
| 2010s | 248.62 one-year-olds | 119.36 one-year-olds | 318.7 one-year-olds | 10 |
| 2020s | 597.9 one-year-olds | 357.6 one-year-olds | 937.65 one-year-olds | 4 |
Countries ranked near Sao Tome and Principe
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Frequently asked questions
- What is number of one-year-olds who are not vaccinated against polio in Sao Tome and Principe?
- Number of one-year-olds who are not vaccinated against polio in Sao Tome and Principe was 937.65 one-year-olds in 2023, according to WHO & UNICEF (2025); UN, World Population Prospects (2024) – processed by Our World in Data.
- What is the highest number of one-year-olds who are not vaccinated against polio recorded in Sao Tome and Principe?
- The highest recorded value was 1,997 one-year-olds in 1985.
- What is the lowest number of one-year-olds who are not vaccinated against polio recorded in Sao Tome and Principe?
- The lowest recorded value was 55.08 one-year-olds in 2004.
- How does Sao Tome and Principe rank for number of one-year-olds who are not vaccinated against polio?
- Sao Tome and Principe ranks 149th out of 194 countries with data for 2023.
- Is number of one-year-olds who are not vaccinated against polio rising or falling in Sao Tome and Principe?
- Over the last ten years it is up 413.4%. The long-run trend across the full record is volatile.
- Where does this Sao Tome and Principe data come from?
- The figures come from WHO & UNICEF (2025); UN, World Population Prospects (2024) – processed by Our World in Data, published as part of Number of one-year-olds who are not vaccinated against polio. Statizoid updates them automatically from the source API.
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About this data
Number of one-year-olds who have not had the third dose of either the oral or inactivated polio vaccine in a given year.