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

30 years are reported by both, from 1979 to 2025.

Where does this data come from?

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

Congo vs Sierra Leone: Pertussis - number of reported cases, gaps filled

Congo

in 2025

Sierra Leone

in 2025

Congo rank

137th

Sierra Leone rank

137th

Pertussis - number of reported cases, gaps filled over time

Congo
Sierra Leone

How they compare

Congo currently reports 0 against 0 in Sierra Leone, a difference of 0.

The two have swapped places 13 times across 30 shared years of data; in 1979 it was Congo ahead.

Congo ranks 137th and Sierra Leone ranks 137th of 210 countries.

Across the 6 decades both report, Congo averaged higher in 5 and Sierra Leone in 1.

Head to head by decade

Decade	Congo	Sierra Leone	Difference	Ahead
1970s	4,345	1,425	2,920	Congo
1980s	2,108	1,160	948.89	Congo
1990s	12.5	0	12.5	Congo
2000s	34	1.73	32.27	Congo
2010s	0	20.12	20.12	Sierra Leone
2020s	2.8	0	2.8	Congo

Averages of every year both report within each decade.

Frequently asked questions

Which has higher pertussis - number of reported cases, gaps filled, Congo or Sierra Leone?: Congo, at 0 against 0 in Sierra Leone as of 2025.
What is the difference in pertussis - number of reported cases, gaps filled between Congo and Sierra Leone?: 0, with Congo ahead.
How many years of comparable data are there for Congo and Sierra Leone?: 30 years are reported by both, from 1979 to 2025.
How do Congo and Sierra Leone rank globally for pertussis - number of reported cases, gaps filled?: Congo ranks 137th and Sierra Leone ranks 137th of 210 countries.
Where does this data come from?: Statizoid (derived), published as Pertussis - number of reported cases, gaps filled. 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, gaps filled. Statizoid, drawing on Statizoid (derived). Retrieved 01 September 2026, from https://health.statizoid.com/compare/pertussis-number-of-reported-cases-gaps-filled/congo-rep/sierra-leone/

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About this data

Indicator: Pertussis - number of reported cases, gaps filled
Source: Statizoid (derived)
Licence: Derived by Statizoid from the sources named on the page
Coverage: 223 places, 9,846 data points, 1974–2025
Last refreshed: 01 September 2026

Pertussis - number of reported cases with 623 missing years estimated by linear interpolation between the nearest real observations. Only gaps of 4 years or fewer are filled, and never beyond the first or last actual measurement — these are filled holes, not forecasts.