How many years of comparable data are there for Bulgaria and Chad?

10 years are reported by both, from 1998 to 2018.

Where does this data come from?

UNESCO Institute for Statistics, published as Out-of-school rate for adolescents and youth of lower and upper secondary school age, adjusted gender parity index (GPIA). Statizoid refreshes it automatically from the source and publishes the full history for both places.

Bulgaria vs Chad: Out-of-school rate for adolescents and youth of lower and upper

Bulgaria

1.18 GPIA

in 2018

Chad

1.19 GPIA

in 2019

Bulgaria rank

21st

Chad rank

19th

Out-of-school rate for adolescents and youth of lower and upper over time

Bulgaria
Chad

How they compare

Chad currently reports 1.19 GPIA against 1.18 GPIA in Bulgaria, a difference of 0.01 GPIA.

The two have swapped places 2 times across 10 shared years of data; in 1998 it was Chad ahead.

Bulgaria ranks 21st and Chad ranks 19th of 137 countries.

Across the 3 decades both report, Bulgaria averaged higher in 1 and Chad in 2.

Head to head by decade

Decade	Bulgaria	Chad	Difference	Ahead
1990s	1.08 GPIA	1.19 GPIA	0.1111 GPIA	Chad
2000s	1.18 GPIA	1.21 GPIA	0.0305 GPIA	Chad
2010s	1.23 GPIA	1.21 GPIA	0.0227 GPIA	Bulgaria

Averages of every year both report within each decade.

Frequently asked questions

Which has higher out-of-school rate for adolescents and youth of lower and upper, Bulgaria or Chad?: Chad, at 1.19 GPIA against 1.18 GPIA in Bulgaria as of 2019.
What is the difference in out-of-school rate for adolescents and youth of lower and upper between Bulgaria and Chad?: 0.01 GPIA, with Chad ahead.
How many years of comparable data are there for Bulgaria and Chad?: 10 years are reported by both, from 1998 to 2018.
How do Bulgaria and Chad rank globally for out-of-school rate for adolescents and youth of lower and upper?: Bulgaria ranks 21st and Chad ranks 19th of 137 countries.
Where does this data come from?: UNESCO Institute for Statistics, published as Out-of-school rate for adolescents and youth of lower and upper secondary school age, adjusted gender parity index (GPIA). Statizoid refreshes it automatically from the source and publishes the full history for both places.

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Bulgaria vs Chad: Out-of-school rate for adolescents and youth of lower and upper. Statizoid, drawing on UNESCO Institute for Statistics. Retrieved 11 September 2026, from https://reference.statizoid.com/compare/out-of-school-rate-for-adolescents-and-youth-of-lower-and-upper-secondary-school-age-2/bulgaria/chad/

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<a href="https://reference.statizoid.com/compare/out-of-school-rate-for-adolescents-and-youth-of-lower-and-upper-secondary-school-age-2/bulgaria/chad/">Bulgaria vs Chad: Out-of-school rate for adolescents and youth of lower and upper</a> — Statizoid

About this data

Indicator: Out-of-school rate for adolescents and youth of lower and upper secondary school age, adjusted gender parity index (GPIA)
Unit: GPIA
Source: UNESCO Institute for Statistics
Licence: CC BY 4.0 (World Bank Open Data)
Coverage: 180 places, 4,096 data points, 1970–2019
Last refreshed: 04 September 2026

The Adjusted Gender Parity Index (GPIA) is calculated by dividing the female value for the indicator by the male value for the indicator. If the resulting value exceeds 1, the ratio is inverted and subtracted from 2. The adjusted gender parity index is symmetrical around 1 and lies in the range 0-2. An adjusted GPI equal to 1 indicates parity between females and males. In general, a value less than 1 indicates disparity in favor of males and a value greater than 1 indicates disparity in favor of females. For more information, consult the UNESCO Institute for Statistics: http://uis.unesco.org/