The average IQ of sub-Saharan Africans is around 82, compared to UK norms, but more psychometric studies are needed to address measurement bias in western IQ tests.

A systematic literature review of the average IQ of sub-Saharan Africans

The mean IQ is 9.6 points lower for conduct disorders than emotional disorders, with mixed disorders in between, and 6.0 points lower for girls than boys.

The relationship between normal variation in IQ and common childhood psychopathology: A clinical study

Children with learning disabilities show specific cognitive deficits in mathematics and reading, beyond the influence of IQ.

Numerical and arithmetical cognition: a longitudinal study of process and concept deficits in children with learning disability.

IQ at age 7 years is linearly related to birth weight in children of normal birth weight, with a stronger association for boys within same sex sibships.

Influence of variation in birth weight within normal range and within sibships on IQ at age 7 years: cohort study

Childhood IQ is a reliable predictor of cognitive functioning in adults with autism, but a significant minority remains untestable due to severe behavioral disturbances and language impairments.

Cognitive and language skills in adults with autism: a 40-year follow-up.

The average IQ score of learning disability samples is significantly below 100 due to the relationship between achievement and IQ, with correlations between achievement and IQ increasing as the average IQ score decreases.

The Bivariate Normal Distribution and the IQ of Learning Disability Samples

Highly intelligent adults (IQ  120) exhibit typical cognitive performance, which can help clinicians identify abnormal cognitive decline in individuals at risk for progressive dementia.

IQ-Based Norms for Highly Intelligent Adults

Adults with autism have improved outcomes, but many remain highly dependent on others for support, with childhood performance IQ being a variable prognostic indicator.

Adult outcome for children with autism.

Extremely high intelligence is genetically continuous with normal-range intelligence in the population, with three variants in locus ADAM12 showing genome-wide significance.

A genome-wide association study for extremely high intelligence

Intelligence is influenced by both biological and social factors, with the IQ gap between Blacks and Whites narrowing by 0.33 SD in recent years.

Intelligence: new findings and theoretical developments.

Longer birth length, higher birth weight, or larger head circumferences within the normal birth size range are associated with higher IQ scores in Asian children.

The Influence of Birth Size on Intelligence in Healthy Children

Higher intelligence levels are associated with faster nerve conduction velocity in a brain pathway, suggesting a link between brain speed and intelligence.

Conduction velocity in a brain nerve pathway of normal adults correlates with intelligence level

Childhood IQ's can predict adult education and occupational status, but not long-term predictions for individual normal children.

Childhood IQ's as Predictors of Adult Educational and Occupational Status

Most severe intellectual disability is caused by distinct genetic and environmental factors, making it a distinct disorder from mild intellectual disability, which represents the low extreme of the normal distribution of intelligence.

Discontinuity in the genetic and environmental causes of the intellectual disability spectrum

Children at risk for a learning disability in mathematics or reading show different patterns of intact cognitive functions and deficits, accounting for 50-100% of group differences in achievement beyond IQ.

Numerical and arithmetical cognition: patterns of functions and deficits in children at risk for a mathematical disability.

Childhood IQ's can predict adult education and occupational status, but not enough for practical purposes.

Childhood IQ's as Predictors of Adult Educational and Occupational Status.

IQ predicts neuropsychological performance across the entire intelligence spectrum, with greater impact on individuals with average or below average IQ than those with above average IQ.

How well does IQ predict neuropsychological test performance in normal adults?

The mean IQ of Americans increased by 13.8 points from 1932 to 1978, with higher norms being established in each sample, posing a serious problem for causal explanation.

The mean IQ of Americans: Massive gains 1932 to 1978.

The WRAT-R reading test is the preferred measure of premorbid verbal intelligence in neurologically impaired patients due to its psychometric and clinical advantages over the NAART.

The comparability of the WRAT-R reading test and NAART as estimates of premorbid intelligence in neurologically impaired patients.

A high normal level of fasting blood glucose is not related to a higher degree of IQ in medical students.

Relationship of the level of normal glycemia with the IQ in students of the medicine. National university of Trujillo. Perú. 2017

These studies suggest that the normal IQ range is centered around 100, with variations influenced by factors such as conduct disorders, learning disabilities, birth weight, and genetic and social factors.