Sierra Leone: Immunization, HepB3 (% of one-year-old children)

Key figures

What the numbers say

In 2024, Sierra Leone's immunization, HepB3 (% of one-year-old children) did not change 0 percentage points on 2023 (from 91% to 91%).

Across the 16 yearly changes before that (2008 to 2023), the average change was +1.75 percentage points and a typical year strayed about 5 percentage points from that (the standard deviation). This year's change was 0.3 standard deviations below that average, so it was an ordinary year: it sits within the range of normal year-to-year movement.

On record, the biggest yearly rise was 14 percentage points in 2008 and the biggest yearly fall was 9 percentage points in 2014. The numbers show how large and when, not why; for the cause, look at what happened in that country in those years.

From 2015 to 2024 there is no clear straight-line trend: a straight line explains 28% of the movement over 10 observed years, so the value is moving around more than it is heading anywhere.

Worked out from the yearly values above. How the checks work: standard deviation, z-scores and straight-line trends.

How it compares

In 2024, Sierra Leone had the 82nd highest value of the 183 economies reporting that year. Higher is not always better: for some indicators the lowest value is the one to aim for. See the full ranking.

Closest to Sierra Leone in the 2024 ranking

• Malawi — 85th of 183: 91%
• North Macedonia — 86th of 183: 91%
• Senegal — 87th of 183: 91%
• Uganda — 89th of 183: 91%
• West Bank and Gaza — 90th of 183: 91%
• Zambia — 91st of 183: 91%

What this measures

Child immunization rate, hepatitis B is the percentage of children ages 12-23 months who received hepatitis B vaccinations before 12 months or at any time before the survey. A child is considered adequately immunized after three doses.

Limitations: In many developing countries a lack of precise information on the size of the cohort of one-year-old children makes immunization coverage difficult to estimate from program statistics.

Regional and income-group figures are computed by the World Bank as a weighted average.

All 18 values

Immunization, HepB3 (% of one-year-old children) in nearby economies

• Angola — 64% (2024)
• Benin — 63% (2024)
• Botswana — 95% (2024)
• Burkina Faso — 91% (2024)
• Burundi — 89% (2024)
• Cabo Verde — 93% (2024)
• Cameroon — 77% (2024)
• Central African Republic — 42% (2024)
• Chad — 68% (2024)
• Comoros

More health data for Sierra Leone

• Population ages 00-04, female (% of female population) — 13.22% (2025)
• Population ages 00-04, male (% of male population) — 13.55% (2025)
• Population ages 0-14, female — 1.65 million (2025)
• Population ages 0-14, female (% of female population) — 37.28% (2025)
• Population ages 0-14, male — 1.67 million (2025)
• Population ages 0-14, male (% of male population) — 38.03% (2025)
• Population ages 0-14, total — 3.32 million (2025)
• Population ages 0-14 (% of total population) — 37.65% (2025)
• Population ages 05-09, female (% of female population) — 12.34% (2025)

Reading data like this

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Questions people ask

What is Sierra Leone's immunization, HepB3 (% of one-year-old children)?

91% in 2024, according to the World Bank (World Development Indicators).

How has it changed since 2007?

It is up 28 percentage points from 63% in 2007. The highest value was 95% in 2019 and the lowest 63% in 2007.

How does Sierra Leone rank?

82nd highest of 183 economies with data for 2024.

Is the latest change in immunization, HepB3 (% of one-year-old children) unusual for Sierra Leone?

In 2024, Sierra Leone's immunization, HepB3 (% of one-year-old children) did not change 0 percentage points on 2023 (from 91% to 91%). Across the 16 yearly changes before that (2008 to 2023), the average change was +1.75 percentage points and a typical year strayed about 5 percentage points from that (the standard deviation). This year's change was 0.3 standard deviations below that average, so it was an ordinary year: it sits within the range of normal year-to-year movement.

Source

World Bank, World Development Indicators, indicator SH.IMM.HEPB, licensed CC BY 4.0. Original source: World Health Organization (WHO), uri: http://www.who.int/immunization/monitoring_surveillance/en/; UN Children's Fund (UNICEF) Figures are fetched from the World Bank API and refreshed monthly; see the series on data.worldbank.org. The full definition and method are in the World Bank's metadata glossary. Comparisons use the same World Bank release.

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