What is the difference in theoretical duration of lower secondary education between Puerto Rico and Sao Tome and Principe?

0 years, with Puerto Rico ahead.

How many years of comparable data are there for Puerto Rico and Sao Tome and Principe?

24 years are reported by both, from 1997 to 2020.

Where does this data come from?

UNESCO Institute for Statistics, published as Theoretical duration of lower secondary education (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.

Puerto Rico vs Sao Tome and Principe: Theoretical duration of lower secondary education

Puerto Rico

3 years

in 2020

Sao Tome and Principe

3 years

in 2020

Puerto Rico rank

81st

Sao Tome and Principe rank

81st

Theoretical duration of lower secondary education over time

Puerto Rico
Sao Tome and Principe

How they compare

Puerto Rico currently reports 3 years against 3 years in Sao Tome and Principe, a difference of 0 years.

The two have swapped places 2 times across 24 shared years of data; in 1997 it was Sao Tome and Principe ahead.

Puerto Rico ranks 81st and Sao Tome and Principe ranks 81st of 209 countries.

Across the 4 decades both report, Puerto Rico averaged higher in 1 and Sao Tome and Principe in 1.

Head to head by decade

Decade	Puerto Rico	Sao Tome and Principe	Difference	Ahead
1990s	3 years	4 years	1 years	Sao Tome and Principe
2000s	3 years	2.4 years	0.6 years	Puerto Rico
2010s	3 years	3 years	0 years	—
2020s	3 years	3 years	0 years	—

Averages of every year both report within each decade.

Frequently asked questions

Which has higher theoretical duration of lower secondary education, Puerto Rico or Sao Tome and Principe?: Puerto Rico, at 3 years against 3 years in Sao Tome and Principe as of 2020.
What is the difference in theoretical duration of lower secondary education between Puerto Rico and Sao Tome and Principe?: 0 years, with Puerto Rico ahead.
How many years of comparable data are there for Puerto Rico and Sao Tome and Principe?: 24 years are reported by both, from 1997 to 2020.
How do Puerto Rico and Sao Tome and Principe rank globally for theoretical duration of lower secondary education?: Puerto Rico ranks 81st and Sao Tome and Principe ranks 81st of 209 countries.
Where does this data come from?: UNESCO Institute for Statistics, published as Theoretical duration of lower secondary education (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Puerto Rico vs Sao Tome and Principe: Theoretical duration of lower secondary education. Statizoid, drawing on UNESCO Institute for Statistics. Retrieved 12 September 2026, from https://education.statizoid.com/compare/theoretical-duration-of-lower-secondary-education-years/puerto-rico-us/sao-tome-and-principe/

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About this data

Indicator: Theoretical duration of lower secondary education (years)
Unit: years
Source: UNESCO Institute for Statistics
Licence: CC BY 4.0 (World Bank Open Data)
Coverage: 209 places, 10,366 data points, 1970–2020
Last refreshed: 04 September 2026

Number of grades (years) in lower secondary education.