How many years of comparable data are there for Sierra Leone and Tanzania, United Republic of?

21 years are reported by both, from 1979 to 2011.

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.

Sierra Leone vs Tanzania, United Republic of: Pertussis - number of reported cases, gaps filled

Sierra Leone

in 2025

Tanzania, United Republic of

in 2013

Sierra Leone rank

137th

Tanzania, United Republic of rank

137th

Pertussis - number of reported cases, gaps filled over time

Sierra Leone
Tanzania, United Republic of

How they compare

Sierra Leone currently reports 0 against 0 in Tanzania, United Republic of, a difference of 0.

The two have swapped places 3 times across 21 shared years of data; in 1979 it was Tanzania, United Republic of ahead.

Sierra Leone ranks 137th and Tanzania, United Republic of ranks 137th of 210 countries.

Across the 4 decades both report, Sierra Leone averaged higher in 1 and Tanzania, United Republic of in 3.

Head to head by decade

Decade	Sierra Leone	Tanzania, United Republic of	Difference	Ahead
1970s	1,425	1,991	566	Tanzania, United Republic of
1980s	1,160	1,829	669.56	Tanzania, United Republic of
2000s	1.92	3.78	1.86	Tanzania, United Republic of
2010s	20.12	0	20.12	Sierra Leone

Averages of every year both report within each decade.

Frequently asked questions

Which has higher pertussis - number of reported cases, gaps filled, Sierra Leone or Tanzania, United Republic of?: Sierra Leone, at 0 against 0 in Tanzania, United Republic of as of 2025.
What is the difference in pertussis - number of reported cases, gaps filled between Sierra Leone and Tanzania, United Republic of?: 0, with Sierra Leone ahead.
How many years of comparable data are there for Sierra Leone and Tanzania, United Republic of?: 21 years are reported by both, from 1979 to 2011.
How do Sierra Leone and Tanzania, United Republic of rank globally for pertussis - number of reported cases, gaps filled?: Sierra Leone ranks 137th and Tanzania, United Republic of 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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Sierra Leone vs Tanzania, United Republic of: Pertussis - number of reported cases, gaps filled. Statizoid, drawing on Statizoid (derived). Retrieved 08 September 2026, from https://health.statizoid.com/compare/pertussis-number-of-reported-cases-gaps-filled/sierra-leone/tanzania/

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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.