Chad vs Sao Tome and Principe: Official entrance age to lower secondary education
Chad
12 years
in 2025
Sao Tome and Principe
12 years
in 2025
Chad rank
30th
Sao Tome and Principe rank
30th
Official entrance age to lower secondary education over time
- Chad
- Sao Tome and Principe
How they compare
Chad currently reports 12 years against 12 years in Sao Tome and Principe, a difference of 0 years.
The two have swapped places 1 time across 56 shared years of data; in 1970 it was Chad ahead.
Chad ranks 30th and Sao Tome and Principe ranks 30th of 221 countries.
Across the 6 decades both report, Chad averaged higher in 3 and Sao Tome and Principe in 1.
Head to head by decade
| Decade | Chad | Sao Tome and Principe | Difference | Ahead |
|---|---|---|---|---|
| 1970s | 12 years | 11 years | 1 years | Chad |
| 1980s | 12 years | 11 years | 1 years | Chad |
| 1990s | 12 years | 11.2 years | 0.8 years | Chad |
| 2000s | 12 years | 12.6 years | 0.6 years | Sao Tome and Principe |
| 2010s | 12 years | 12 years | 0 years | — |
| 2020s | 12 years | 12 years | 0 years | — |
Averages of every year both report within each decade.
Frequently asked questions
- Which has higher official entrance age to lower secondary education, Chad or Sao Tome and Principe?
- Chad, at 12 years against 12 years in Sao Tome and Principe as of 2025.
- What is the difference in official entrance age to lower secondary education between Chad and Sao Tome and Principe?
- 0 years, with Chad ahead.
- How many years of comparable data are there for Chad and Sao Tome and Principe?
- 56 years are reported by both, from 1970 to 2025.
- How do Chad and Sao Tome and Principe rank globally for official entrance age to lower secondary education?
- Chad ranks 30th and Sao Tome and Principe ranks 30th of 221 countries.
- Where does this data come from?
- UNESCO Institute for Statistics, published as Official entrance age to lower secondary education (years). Statizoid refreshes it automatically from the source and publishes the full history for both places.
Individual pages
About this data
February 2026 Data Release