How many years of comparable data are there for Niger 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.

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

Niger

in 2025

Sierra Leone

in 2025

Niger rank

137th

Sierra Leone rank

137th

Pertussis - number of reported cases, gaps filled over time

Niger
Sierra Leone

How they compare

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

The two have swapped places 3 times across 30 shared years of data; in 1979 it was Niger ahead.

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

Niger has averaged higher in every one of the 6 decades both report.

Head to head by decade

Decade	Niger	Sierra Leone	Difference	Ahead
1970s	7,315	1,425	5,890	Niger
1980s	5,905	1,160	4,746	Niger
1990s	2,752	0	2,752	Niger
2000s	2,412	1.73	2,411	Niger
2010s	506.5	20.12	486.38	Niger
2020s	413.2	0	413.2	Niger

Averages of every year both report within each decade.

Frequently asked questions

Which has higher pertussis - number of reported cases, gaps filled, Niger or Sierra Leone?: Niger, at 0 against 0 in Sierra Leone as of 2025.
What is the difference in pertussis - number of reported cases, gaps filled between Niger and Sierra Leone?: 0, with Niger ahead.
How many years of comparable data are there for Niger and Sierra Leone?: 30 years are reported by both, from 1979 to 2025.
How do Niger and Sierra Leone rank globally for pertussis - number of reported cases, gaps filled?: Niger 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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Niger 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/niger/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.