Number of one-year-olds who are not vaccinated against diphtheria in Sierra Leone
Sierra Leone: Number of one-year-olds who are not vaccinated against diphtheria was 0.2936 one-year-olds per square kilometre in 2023. ◆ Volatile
Number of one-year-olds who are not vaccinated against diphtheria in Sierra Leone, 1999–2023
Source: Statizoid (derived). Measured in one-year-olds per square kilometre.
Analysis
The most recent figure for number of one-year-olds who are not vaccinated against diphtheria in Sierra Leone is 0.2936 one-year-olds per square kilometre, measured in 2023.
Compared with earlier readings it is up 0.7% on the previous year and up 21.3% over ten years.
Over the whole period, number of one-year-olds who are not vaccinated against diphtheria in Sierra Leone peaked at 1.47 one-year-olds per square kilometre in 2001 and was at its lowest, 0.1574 one-year-olds per square kilometre, in 2019.
Sierra Leone ranks 59th of 192 countries on this measure, in the middle of the range.
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 diphtheria in Sierra Leone, year by year
| Year | one-year-olds per square kilometre | Change |
|---|---|---|
| 1999 | 1.25 one-year-olds per square kilometre | — |
| 2000 | 1.26 one-year-olds per square kilometre | +0.7% |
| 2001 | 1.47 one-year-olds per square kilometre | +17.2% |
| 2002 | 1.18 one-year-olds per square kilometre | -19.9% |
| 2003 | 0.7032 one-year-olds per square kilometre | -40.5% |
| 2004 | 0.9344 one-year-olds per square kilometre | +32.9% |
| 2005 | 0.9427 one-year-olds per square kilometre | +0.9% |
| 2006 | 0.9748 one-year-olds per square kilometre | +3.4% |
| 2007 | 0.9905 one-year-olds per square kilometre | +1.6% |
| 2008 | 0.6448 one-year-olds per square kilometre | -34.9% |
| 2009 | 0.4572 one-year-olds per square kilometre | -29.1% |
| 2010 | 0.4076 one-year-olds per square kilometre | -10.8% |
| 2011 | 0.3246 one-year-olds per square kilometre | -20.4% |
| 2012 | 0.2691 one-year-olds per square kilometre | -17.1% |
| 2013 | 0.2421 one-year-olds per square kilometre | -10.0% |
| 2014 | 0.5163 one-year-olds per square kilometre | +113.2% |
| 2015 | 0.4246 one-year-olds per square kilometre | -17.8% |
| 2016 | 0.4855 one-year-olds per square kilometre | +14.4% |
| 2017 | 0.3058 one-year-olds per square kilometre | -37.0% |
| 2018 | 0.2172 one-year-olds per square kilometre | -29.0% |
| 2019 | 0.1574 one-year-olds per square kilometre | -27.6% |
| 2020 | 0.2866 one-year-olds per square kilometre | +82.1% |
| 2021 | 0.2571 one-year-olds per square kilometre | -10.3% |
| 2022 | 0.2915 one-year-olds per square kilometre | +13.4% |
| 2023 | 0.2936 one-year-olds per square kilometre | +0.7% |
Sierra Leone compared with similar countries
- Sierra Leone's 0.2936 one-year-olds per square kilometre is below the median for low income countries, which is 0.4431 one-year-olds per square kilometre, 66% of the median. (25 countries reporting)
- Sierra Leone's 0.2936 one-year-olds per square kilometre is above the median for Sub-Saharan Africa, which is 0.2848 one-year-olds per square kilometre, 1.0× the median. (48 countries reporting)
Averages by decade
| Decade | Average | Lowest | Highest | Years |
|---|---|---|---|---|
| 1990s | 1.25 one-year-olds per square kilometre | 1.25 one-year-olds per square kilometre | 1.25 one-year-olds per square kilometre | 1 |
| 2000s | 0.9561 one-year-olds per square kilometre | 0.4572 one-year-olds per square kilometre | 1.47 one-year-olds per square kilometre | 10 |
| 2010s | 0.335 one-year-olds per square kilometre | 0.1574 one-year-olds per square kilometre | 0.5163 one-year-olds per square kilometre | 10 |
| 2020s | 0.2822 one-year-olds per square kilometre | 0.2571 one-year-olds per square kilometre | 0.2936 one-year-olds per square kilometre | 4 |
Countries ranked near Sierra Leone
- 56 San Marino 0.3315 one-year-olds per square kilometre compare
- 57 Ecuador 0.3313 one-year-olds per square kilometre compare
- 58 Cambodia 0.3271 one-year-olds per square kilometre compare
- 60 Djibouti 0.2777 one-year-olds per square kilometre compare
- 61 Panama 0.2763 one-year-olds per square kilometre compare
- 62 Liberia 0.276 one-year-olds per square kilometre compare
More health data for Sierra Leone
- Un projection of annual infant deaths, annual growth rate -2.34 % change on previous year (2100)
- Heat deaths vs projected death rates, annual growth rate 0.773 % change on previous year (2090)
- Estimated changes in temperature-related death rates compared to projected death rates 1,199 deaths per 1,000 people (2090)
- Number of infants who die before age 1 4,209 deaths (2100)
- Neonatal tetanus - number of reported cases, gaps filled 38 (2025)
- Population ages 00-04, female, annual growth rate 0.6447 % change on previous year (2025)
- Population ages 00-04, female, per unit of GDP 0.0001 units per US$ of GDP (2025)
- Population ages 00-04, female, per capita 0.0663 units per person (2025)
- Population ages 00-04, male, annual growth rate 0.6611 % change on previous year (2025)
- Population ages 00-04, male, per unit of GDP 0.0001 units per US$ of GDP (2025)
Frequently asked questions
- What is number of one-year-olds who are not vaccinated against diphtheria in Sierra Leone?
- Number of one-year-olds who are not vaccinated against diphtheria in Sierra Leone was 0.2936 one-year-olds per square kilometre in 2023, according to Statizoid (derived).
- What is the highest number of one-year-olds who are not vaccinated against diphtheria recorded in Sierra Leone?
- The highest recorded value was 1.47 one-year-olds per square kilometre in 2001.
- What is the lowest number of one-year-olds who are not vaccinated against diphtheria recorded in Sierra Leone?
- The lowest recorded value was 0.1574 one-year-olds per square kilometre in 2019.
- How does Sierra Leone rank for number of one-year-olds who are not vaccinated against diphtheria?
- Sierra Leone ranks 59th out of 192 countries with data for 2023.
- Is number of one-year-olds who are not vaccinated against diphtheria rising or falling in Sierra Leone?
- Over the last ten years it is up 21.3%. The long-run trend across the full record is volatile.
- Where does this Sierra Leone data come from?
- The figures come from Statizoid (derived), published as part of Number of one-year-olds who are not vaccinated against diphtheria, pertussis and tetanus, per square kilometre. Statizoid updates them automatically from the source API.
Download this data
CSV · JSON — 25 observations, free to reuse under Derived by Statizoid from the sources named on the page.
How this figure is calculated
Number of one-year-olds who are not vaccinated against diphtheria, pertussis and tetanus divided by Land area (sq. km), matched on country and year. Neither publisher issues this ratio as a series; it is computed here from both.
Number of one-year-olds who are not vaccinated against diphtheria, pertussis and tetanus ÷ Land area (sq. km)
Computed from
- Number of one-year-olds who are not vaccinated against diphtheria, pertussis and tetanus WHO & UNICEF (2025); UN, World Population Prospects (2024) – processed by Our World in Data
- Land area FAOSTAT, Food and Agriculture Organization of the United Nations (FAO)
Statizoid computes this series; the underlying measurements belong to the publishers named above. The arithmetic is applied to every country and year where both inputs report, and nothing is estimated unless the page says so.
About this data
Number of one-year-olds who are not vaccinated against diphtheria, pertussis and tetanus divided by Land area (sq. km), matched on country and year. Neither publisher issues this ratio as a series; it is computed here from both.