Average IQ in Northern Ireland: What PISA 2022 Can—and Cannot—Tell Us

What did Northern Ireland score in PISA 2022?

Northern Ireland was close to the OECD average in mathematics and science and above it in reading. The Department of Education's national report gives these means:

The figures came from 2,384 15-year-old pupils in 80 schools. Pupils completed a two-hour computer-based assessment and questionnaire in November and December 2022. The PISA age window is approximately 15 years and 3 months to 16 years and 2 months, so these results do not describe adults, younger children, or every person who identifies with Northern Ireland.

PISA is designed for education-system comparisons. Its tasks include learned content and real-life applications, and the scale is maintained across cycles. That makes it useful for asking how a school system is performing; it does not make the scale an IQ test.

How should the sample limitations change the interpretation?

The report explicitly says that Northern Ireland's 2022 sample may not be fully representative. Two of PISA's 82 technical standards were not met. Recruitment overlapped with industrial action by teaching unions, which affected school participation. The report's analysis suggested that mathematics and reading means may be somewhat higher than they would be for the full population, but it did not produce a valid correction for Northern Ireland.

The OECD did not adjust scores for education systems that missed technical standards. The Department therefore recommends caution when comparing Northern Ireland with other systems or subgroups. A ranking built from unadjusted means should not be retold as a ranking of national intelligence. Sampling uncertainty is part of the result, not a footnote to ignore.

What changed between PISA 2018 and 2022?

Mathematics and reading fell significantly from 2018, while science did not change significantly. The reported trend values are:

The four-year gap between cycles reflects the COVID-19 pandemic. School closures, attendance, wellbeing, curriculum, participation, and the conditions of testing can all affect achievement. A decline in a learning assessment is not evidence that the underlying intelligence of Northern Ireland's population declined. Nor can a rise in one cycle prove that a population became intrinsically more intelligent.

What do proficiency levels reveal?

The distribution of pupils is more informative than a single mean. In mathematics, 8% of Northern Ireland pupils reached PISA Levels 5 or 6, compared with 9% across the OECD, while 28% were below Level 2, compared with 31% across the OECD. In reading, 8% reached Levels 5 or 6 and 22% were below Level 2, compared with OECD shares of 7% and 26%. In science, 7% reached the top two levels and 23% were below Level 2, compared with 7% and 24% across the OECD.

PISA proficiency levels describe what pupils demonstrated on PISA tasks. They are not IQ bands, clinical thresholds, or labels for individual children. A mean can conceal a wide spread, and a level boundary is meaningful only within the PISA framework that defines it.

How do gender and socioeconomic differences appear?

The report finds subject-specific gaps, not one general ability difference. In mathematics, boys averaged 481 and girls 469. In reading, girls averaged 494 and boys 476. In science, boys averaged 492 and girls 485; that difference was not statistically significant. These are group means on separate achievement domains, not evidence that one gender has a fixed IQ advantage.

Socioeconomic differences were substantial. The gap between the least and most disadvantaged quarters was 81 PISA points in mathematics, 78 in reading, and 86 in science. Socioeconomic status explained 12% of the variation in mathematics and science and 9% in reading. These associations show why opportunity, resources, school context, and support belong in any interpretation of performance data.

Language also matters. Pupils who spoke a language other than English at home averaged 461 in mathematics, compared with 479 for pupils who spoke English at home. In reading the means were 467 and 490, and in science 472 and 492. Such differences may reflect language exposure and access to instruction; they cannot be translated into innate ability or IQ.

Related

Average IQ in the UK: What PISA Scores Can and Cannot Tell You

There is no official national IQ average for the UK. Learn how PISA, England’s school tests, and properly normed IQ assessments answer different questions.

Is a PISA score the same as an IQ score?

No. There is no scientifically valid conversion from 475 PISA mathematics points to an IQ score. PISA evaluates how a particular age cohort uses learned knowledge in realistic problems. A professional IQ assessment samples constructs such as verbal reasoning, visual-spatial reasoning, working memory, and processing speed, then compares an individual with an age-appropriate norm group.

The instruments, purposes, samples, scales, and uncertainty estimates differ. Rescaling the Northern Ireland mean to a 100/15 distribution would be an invented statistic. It would also hide curriculum, language, school access, and the fact that PISA does not test the entire population.

Why do online Northern Ireland IQ estimates disagree?

Online estimates often combine different tests, years, and self-selected participants. One site may average timed matrix puzzles completed by visitors; another may copy a country table based on old school samples or statistical modelling. People who have internet access, understand the test language, enjoy puzzles, or are curious about IQ are more likely to participate.

Before trusting a number, check the instrument, norm group, age range, recruitment method, year, exclusions, weighting, and uncertainty interval. If those details are missing, treat the figure as an informal estimate rather than a measured regional fact. A large volunteer sample is still not a probability sample.

How can someone in Northern Ireland get a meaningful IQ result?

Choose an age-appropriate, validated assessment administered under standard conditions by a qualified professional. Ask which English-language norms apply, what referral question the assessment answers, and how the evaluator will explain confidence intervals and subtest patterns. School history, language exposure, attention, hearing, vision, health, and educational support should be considered.

An online quiz can be useful practice or entertainment, but it should not be used alone for diagnosis, school placement, employment decisions, or comparisons between regions. A responsible report names the test version, administration conditions, norm group, uncertainty, and abilities that were actually measured.

Related

Average IQ in Europe: How the Continent Compares

The average IQ in Europe is estimated at roughly 97 to 100 on a scale where the global mean is 100, with most countries clustered in the high 90s to low 100s.

Q: What is the average IQ in Northern Ireland?

A: There is no official, current all-age national IQ average for Northern Ireland. PISA 2022 provides achievement scores for sampled 15-year-olds, not one IQ mean for every resident.

Q: What were Northern Ireland's PISA 2022 scores?

A: Northern Ireland averaged 475 in mathematics, 485 in reading, and 488 in science. These are PISA achievement scores, not IQ points.

Q: Can I convert a PISA score into IQ?

A: No. PISA and IQ tests measure different constructs with different samples, norms, and scales. There is no valid conversion formula.

Q: Why should the 2022 results be treated cautiously?

A: Two PISA technical standards were not met, and participation was affected by industrial action. The official report says the sample may not fully represent all 15-year-olds, so comparisons need caution.

Q: How can I measure IQ in Northern Ireland?

A: Use a validated, properly normed assessment administered under standard conditions by a qualified professional. Interpretation should include language, age norms, confidence intervals, and the limits of the instrument.

References

• Northern Ireland Department of Education. PISA 2022 National Report for Northern Ireland.
• Northern Ireland Department of Education. PISA 2022 Northern Ireland National Report (PDF).
• Northern Ireland Department of Education. NI pupils perform well in mathematics, reading and science in international survey.
• American Psychological Association. IQ definition.

Last updated: July 19, 2026