What is the difference in theoretical duration of lower secondary education between Iran, Islamic Republic of and South Sudan?

0 years, with Iran, Islamic Republic of ahead.

How many years of comparable data are there for Iran, Islamic Republic of and South Sudan?

22 years are reported by both, from 1999 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.

Iran, Islamic Republic of vs South Sudan: Theoretical duration of lower secondary education

Iran, Islamic Republic of

2 years

in 2020

South Sudan

2 years

in 2020

Iran, Islamic Republic of rank

188th

South Sudan rank

188th

Theoretical duration of lower secondary education over time

Iran, Islamic Republic of
South Sudan

How they compare

Iran, Islamic Republic of currently reports 2 years against 2 years in South Sudan, a difference of 0 years.

The two have swapped places 3 times across 22 shared years of data; in 1999 it was Iran, Islamic Republic of ahead.

Iran, Islamic Republic of ranks 188th and South Sudan ranks 188th of 209 countries.

Iran, Islamic Republic of has averaged higher in every one of the 4 decades both report.

Head to head by decade

Decade	Iran, Islamic Republic of	South Sudan	Difference	Ahead
1990s	3 years	2 years	1 years	Iran, Islamic Republic of
2000s	3 years	2 years	1 years	Iran, Islamic Republic of
2010s	2.7 years	2 years	0.7 years	Iran, Islamic Republic of
2020s	2 years	2 years	0 years	—

Averages of every year both report within each decade.

Frequently asked questions

Which has higher theoretical duration of lower secondary education, Iran, Islamic Republic of or South Sudan?: Iran, Islamic Republic of, at 2 years against 2 years in South Sudan as of 2020.
What is the difference in theoretical duration of lower secondary education between Iran, Islamic Republic of and South Sudan?: 0 years, with Iran, Islamic Republic of ahead.
How many years of comparable data are there for Iran, Islamic Republic of and South Sudan?: 22 years are reported by both, from 1999 to 2020.
How do Iran, Islamic Republic of and South Sudan rank globally for theoretical duration of lower secondary education?: Iran, Islamic Republic of ranks 188th and South Sudan ranks 188th 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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Iran, Islamic Republic of vs South Sudan: Theoretical duration of lower secondary education. Statizoid, drawing on UNESCO Institute for Statistics. Retrieved 04 September 2026, from https://education.statizoid.com/compare/theoretical-duration-of-lower-secondary-education-years/iran-islamic-rep/south-sudan/

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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.