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

16 years are reported by both, from 1979 to 2021.

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.

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

Congo

0 units per square kilometre

in 2023

Sierra Leone

0 units per square kilometre

in 2021

Congo rank

130th

Sierra Leone rank

132nd

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

Congo
Sierra Leone

How they compare

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

The two have swapped places 9 times across 16 shared years of data; in 1979 it was Sierra Leone ahead.

Congo ranks 130th and Sierra Leone ranks 132nd of 204 countries.

Across the 6 decades both report, Congo averaged higher in 3 and Sierra Leone in 3.

Head to head by decade

Decade	Congo	Sierra Leone	Difference	Ahead
1970s	0.0127 units per square kilometre	0.0197 units per square kilometre	0.007 units per square kilometre	Sierra Leone
1980s	0.0062 units per square kilometre	0.0161 units per square kilometre	0.0099 units per square kilometre	Sierra Leone
1990s	0 units per square kilometre	0 units per square kilometre	0 units per square kilometre	Congo
2000s	0.0001 units per square kilometre	0 units per square kilometre	0.0001 units per square kilometre	Congo
2010s	0 units per square kilometre	0.0003 units per square kilometre	0.0003 units per square kilometre	Sierra Leone
2020s	0 units per square kilometre	0 units per square kilometre	0 units per square kilometre	Congo

Averages of every year both report within each decade.

Frequently asked questions

Which has higher pertussis - number of reported cases, per square kilometre, Congo or Sierra Leone?: Congo, at 0 units per square kilometre against 0 units per square kilometre in Sierra Leone as of 2023.
What is the difference in pertussis - number of reported cases, per square kilometre between Congo and Sierra Leone?: 0 units per square kilometre, with Congo ahead.
How many years of comparable data are there for Congo and Sierra Leone?: 16 years are reported by both, from 1979 to 2021.
How do Congo and Sierra Leone rank globally for pertussis - number of reported cases, per square kilometre?: Congo ranks 130th and Sierra Leone 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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Congo vs Sierra Leone: 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/congo-rep/sierra-leone/

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<a href="https://health.statizoid.com/compare/pertussis-number-of-reported-cases-per-square-kilometre/congo-rep/sierra-leone/">Congo vs Sierra Leone: 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.