How many years of comparable data are there for Sierra Leone and Zambia?

42 years are reported by both, from 1980 to 2023.

Where does this data come from?

World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data, published as Paralytic polio: estimated cases by world region. Statizoid refreshes it automatically from the source and publishes the full history for both places.

Sierra Leone vs Zambia: Paralytic polio: estimated cases by world region

Sierra Leone

0 cases

in 2023

Zambia

1.11 cases

in 2023

Sierra Leone rank

26th

Zambia rank

23rd

Paralytic polio: estimated cases by world region over time

Sierra Leone
Zambia

How they compare

Zambia currently reports 1.11 cases against 0 cases in Sierra Leone, a difference of 1.11 cases.

The two have swapped places 8 times across 42 shared years of data; in 1980 it was Zambia ahead.

Sierra Leone ranks 26th and Zambia ranks 23rd of 199 countries.

Across the 5 decades both report, Sierra Leone averaged higher in 2 and Zambia in 3.

Head to head by decade

Decade	Sierra Leone	Zambia	Difference	Ahead
1980s	275.1 cases	1,239 cases	963.9 cases	Zambia
1990s	63 cases	449.75 cases	386.75 cases	Zambia
2000s	25.02 cases	1 cases	24.02 cases	Sierra Leone
2010s	0.111 cases	0.222 cases	0.111 cases	Zambia
2020s	7.5 cases	0.2775 cases	7.22 cases	Sierra Leone

Averages of every year both report within each decade.

Frequently asked questions

Which has higher paralytic polio: estimated cases by world region, Sierra Leone or Zambia?: Zambia, at 1.11 cases against 0 cases in Sierra Leone as of 2023.
What is the difference in paralytic polio: estimated cases by world region between Sierra Leone and Zambia?: 1.11 cases, with Zambia ahead.
How many years of comparable data are there for Sierra Leone and Zambia?: 42 years are reported by both, from 1980 to 2023.
How do Sierra Leone and Zambia rank globally for paralytic polio: estimated cases by world region?: Sierra Leone ranks 26th and Zambia ranks 23rd of 199 countries.
Where does this data come from?: World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data, published as Paralytic polio: estimated cases by world region. Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Sierra Leone vs Zambia: Paralytic polio: estimated cases by world region. Statizoid, drawing on World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data. Retrieved 04 September 2026, from https://reference.statizoid.com/compare/number-of-estimated-paralytic-polio-cases-by-world-region/sierra-leone/zambia/

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<a href="https://reference.statizoid.com/compare/number-of-estimated-paralytic-polio-cases-by-world-region/sierra-leone/zambia/">Sierra Leone vs Zambia: Paralytic polio: estimated cases by world region</a> — Statizoid

About this data

Indicator: Paralytic polio: estimated cases by world region
Unit: cases
Source: World Health Organization (2019); World Health Organization (2024) – processed by Our World in Data
Licence: CC BY 4.0 (Our World in Data)
Coverage: 199 places, 7,608 data points, 1980–2023
Last refreshed: 28 August 2026

Total estimated number of polio cases.