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

Key figures

What the numbers say

In 2024, Samoa's immunization, HepB3 (% of one-year-old children) rose 2 percentage points on 2023 (from 83% to 85%).

Across the 30 yearly changes before that (1994 to 2023), the average change was +2.73 percentage points and a typical year strayed about 21.68 percentage points from that (the standard deviation). This year's change was 0.0 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 93 percentage points in 1994 and the biggest yearly fall was 32 percentage points in 2008. 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 17% 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, Samoa had the 121st 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 Samoa in the 2024 ranking

• Austria — 121st of 183: 85%
• Germany — 122nd of 183: 85%
• Micronesia, Fed. Sts. — 123rd of 183: 85%
• Eswatini — 125th of 183: 84%
• Kyrgyz Republic — 126th of 183: 84%
• Cambodia — 127th of 183: 83%

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 33 values

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

• Australia — 95% (2024)
• Brunei Darussalam — 99% (2024)
• Cambodia — 83% (2024)
• China — 96% (2024)
• Fiji — 93% (2024)
• Indonesia — 78% (2024)
• Kiribati — 94% (2024)
• Korea, Dem. People's Rep. — 99% (2024)
• Korea, Rep. — 97% (2024)
• Lao PDR

More health data for Samoa

• Population ages 00-04, female (% of female population) — 11.91% (2025)
• Population ages 00-04, male (% of male population) — 12.59% (2025)
• Population ages 0-14, female — 40,419 (2025)
• Population ages 0-14, female (% of female population) — 37.14% (2025)
• Population ages 0-14, male — 43,051 (2025)
• Population ages 0-14, male (% of male population) — 38.97% (2025)
• Population ages 0-14, total — 83,470 (2025)
• Population ages 0-14 (% of total population) — 38.06% (2025)
• Population ages 05-09, female (% of female population) — 12.82% (2025)
• Population ages 05-09, male (% of male population)

Reading data like this

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Questions people ask

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

85% in 2024, according to the World Bank (World Development Indicators).

How has it changed since 1992?

It is up 67 percentage points from 18% in 1992. The highest value was 99% in 1997 and the lowest 1% in 1993.

How does Samoa rank?

121st highest of 183 economies with data for 2024.

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

In 2024, Samoa's immunization, HepB3 (% of one-year-old children) rose 2 percentage points on 2023 (from 83% to 85%). Across the 30 yearly changes before that (1994 to 2023), the average change was +2.73 percentage points and a typical year strayed about 21.68 percentage points from that (the standard deviation). This year's change was 0.0 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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