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

8 years are reported by both, from 1983 to 2011.

Where does this data come from?

Statizoid (derived), published as Pertussis - number of reported cases, per square kilometre. Statizoid refreshes it automatically from the source and publishes the full history for both places.

Sierra Leone vs Somalia: Pertussis - number of reported cases, per square kilometre

Sierra Leone

0 units per square kilometre

in 2021

Somalia

0 units per square kilometre

in 2020

Sierra Leone rank

132nd

Somalia rank

132nd

Pertussis - number of reported cases, per square kilometre over time

Sierra Leone
Somalia

How they compare

Sierra Leone currently reports 0 units per square kilometre against 0 units per square kilometre in Somalia, a difference of 0 units per square kilometre.

The two have swapped places 1 time across 8 shared years of data; in 1983 it was Sierra Leone ahead.

Sierra Leone ranks 132nd and Somalia ranks 132nd of 204 countries.

Across the 3 decades both report, Sierra Leone averaged higher in 1 and Somalia in 2.

Head to head by decade

Decade	Sierra Leone	Somalia	Difference	Ahead
1980s	0.0122 units per square kilometre	0.0005 units per square kilometre	0.0118 units per square kilometre	Sierra Leone
2000s	0 units per square kilometre	0.0021 units per square kilometre	0.0021 units per square kilometre	Somalia
2010s	0.0003 units per square kilometre	0.0048 units per square kilometre	0.0045 units per square kilometre	Somalia

Averages of every year both report within each decade.

Frequently asked questions

Which has higher pertussis - number of reported cases, per square kilometre, Sierra Leone or Somalia?: Sierra Leone, at 0 units per square kilometre against 0 units per square kilometre in Somalia as of 2021.
What is the difference in pertussis - number of reported cases, per square kilometre between Sierra Leone and Somalia?: 0 units per square kilometre, with Sierra Leone ahead.
How many years of comparable data are there for Sierra Leone and Somalia?: 8 years are reported by both, from 1983 to 2011.
How do Sierra Leone and Somalia rank globally for pertussis - number of reported cases, per square kilometre?: Sierra Leone ranks 132nd and Somalia ranks 132nd of 204 countries.
Where does this data come from?: Statizoid (derived), published as Pertussis - number of reported cases, per square kilometre. Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Sierra Leone vs Somalia: Pertussis - number of reported cases, per square kilometre. Statizoid, drawing on Statizoid (derived). Retrieved 11 September 2026, from https://health.statizoid.com/compare/pertussis-number-of-reported-cases-per-square-kilometre/sierra-leone/somalia-fed-rep/

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<a href="https://health.statizoid.com/compare/pertussis-number-of-reported-cases-per-square-kilometre/sierra-leone/somalia-fed-rep/">Sierra Leone vs Somalia: Pertussis - number of reported cases, per square kilometre</a> — Statizoid

About this data

Indicator: Pertussis - number of reported cases, per square kilometre
Unit: units per square kilometre
Source: Statizoid (derived)
Licence: Derived by Statizoid from the sources named on the page
Coverage: 205 places, 7,899 data points, 1974–2023
Last refreshed: 01 September 2026

Pertussis - number of reported cases 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.