Confusing conditions
Academic underachievement may be seen in children whose cognitive abilities span the entire spectrum from intellectual limitation to giftedness. Underachieving gifted students as a group are more likely than non-underachieving gifted students to score lower in learning strategies, goal orientations, self-concept, and attitudes towards teacher and perceived parental involvement (05).
The differential diagnosis for academic underachievement includes the disorders detailed below (01). It should be remembered that comorbidity is common in academic underachievement and that more than one of the entities in this list of differential diagnoses may be present. For example, a child with specific learning disability may also have ADHD, and children with specific reading disabilities often have co-occurring disorders in written expression.
Specific learning disabilities. Specific learning disabilities are a group of disorders that manifest as academic underachievement despite the student having adequate academic instruction and no intellectual disability. The Individuals with Disabilities Education Improvement Act of 2004 defines specific learning disability as ". . .a disorder in one or more of the basic psychological processes involved in understanding or in using language, spoken or written, that may manifest itself in an imperfect ability to listen, think, speak, read, write, spell or do mathematical calculations. . .” (20 U.S.C. § 1400). Specific learning disabilities may be noted in basic reading (decoding), reading comprehension, mathematic calculation, mathematic reasoning, written expression, listening comprehension, and oral expression.
Attention deficit hyperactivity disorder (ADHD). ADHD is characterized by developmentally inappropriate levels of inattention or hyperactivity/impulsivity that have persisted for more than 6 months, with onset before the age of 12. For diagnosis, the child must manifest six or more of the nine characteristics of inattention or six or more characteristics of hyperactivity/impulsivity contained in the Diagnostic and Statistical Manual of Mental Disorders, 5th edition; significant functional impairment must be present as well. ADHD must be distinguished from secondary causes of inattention and hyperactivity (eg, the difficulty of the material as may be seen in children with intellectual disability, specific learning disabilities, or language disorders).
Intellectual disability (intellectual developmental disorder). Intellectual disability, previously called mental retardation, is characterized by significant limitations in both intellectual functioning and adaptive behavior, which covers many everyday social and practical skills and originates before the age of 18.
Language disorders. Language disorders are one of the specific developmental disorders. They are characterized by weakness in language functions that impairs life activities. In young children, deficient vocabulary and poor grammar are common, whereas older children often show impairments in discourse, pragmatics, and other higher language function. Expressive language disorders are a group of disorders in language production with relative sparing of language understanding and general cognition. By contrast, speech disorders are difficulties producing speech sounds or problems with voice quality.
Social (pragmatic) communication disorders/pervasive developmental disorders. This category encompasses many of the children who were previously diagnosed with pervasive developmental disorder, high-functioning autism, or Asperger syndrome. It is characterized by a primary difficulty with the social use of language and communication and is manifested by deficits in understanding and following social rules of communication in naturalistic contexts, changing language according to the needs of the listener or situation, and following rules for conversations and storytelling.
Autism spectrum disorders. Autism spectrum disorders show persistent deficits in social communication and social interaction across multiple contexts and restricted, repetitive patterns of behavior. It is distinguished from language disorders and social (pragmatic) communication disorder by abnormality of nonverbal communication and the presence of restricted repetitive behaviors. In the classroom, children with autism spectrum disorders may decode well, but have difficulties with comprehension and inference.
Developmental coordination disorders. Developmental coordination disorders are characterized by acquisition and execution of coordinated motor skills that are substantially below what’s expected for the child's age and opportunity. In the classroom, they often impair handwriting, note taking, and timed activities. In early school years, coloring, cutting, and pasting may be affected.
Tourette syndrome. Tourette syndrome is defined by the presence of multifocal tics (including vocal) that have been present for more than a year and have their onset before the age of 18. Vocal tics may be misinterpreted as attention seeking or disruptive behavior but are not responsible for academic underachievement. Tourette syndrome is often associated with ADHD and obsessive-compulsive disorder, but academic underachievement persisted after accounting for these disorders (28).
Epilepsy. Academic dysfunction is common in children with epilepsy (40). Although this has been attributed to cognitive blunting due to antiepileptic drugs (AEDs), some investigators have found improved performance when AEDs were instituted, and others have found cognitive dysfunction in newly diagnosed children who were not exposed to AEDs (14; 11). Children with academic dysfunction who show inattention may be thought to have lapses in consciousness and are evaluated for partial complex epilepsy. Distinguishing inattention from brief lapses in consciousness may be difficult. However, the strongest association between academic performance and epilepsy is found with non-absence generalized seizures (30). Children with electrical status epilepticus during slow-wave sleep may evidence decline in academic trajectory (42).
Adjustment disorders. Adjustment disorders are defined by the development of emotional or behavioral symptoms within 3 months of the onset of stressors. Adjustment disorders may have many causes in school children. Chronic inability to meet expectations, abuse (including bullying), divorce, and other family issues are common.
Anxiety disorders. Anxiety disorders are characterized by more than 6 months of excessive anxiety and worry that is difficult for the individual to control. They may be accompanied by restlessness and difficulty concentrating and misdiagnosed as ADHD. Anxiety disorders may be subcategorized as separation anxiety disorders, social phobias, or selective mutism. A population-based birth cohort study found a strong link between social anxiety disorder and impaired academic performance throughout the formative years (38).
Affective disorder. Affective disorders include major depressive disorder, bipolar disorder, and persistent depressive disorder (dysthymia). Sadness, low energy, poor concentration, and decreased social interaction are often seen. Disruptive mood dysregulation disorder is a group of disorders that have onset before the age of 10 and manifest with chronic, severe, and persistent irritability with frequent temper outbursts.
Substance abuse. Substance abuse disorders must be considered in adolescents who did not have an earlier history of academic underachievement, but who have shown an abrupt change in their classroom behavior, poor homework performance, and apathy.
Hearing loss. Not all hearing loss is present at birth. Although conductive hearing loss is not associated with long-term academic underachievement, sensorineural hearing loss may be progressive in early childhood and may impede academic progress if not detected.
Visual impairment. Most visual impairment is associated with refractive errors and is detected through screening or recognized when children have difficulty with seeing materials on the board. Isolated visual impairment is a rare cause of academic underachievement.
Sleep disorders. Although insufficient prospective data make causal inferences difficult to ascertain, clear and consistent associations have been found between sleep loss, sleepiness, and lower academic achievement among younger children and older adolescents worldwide (34).
Chronic diseases. Chronic conditions such as premature birth (21), sickle cell anemia (17), thyroid disease, diabetes, metabolic syndrome (41), chronic kidney disease (13), congenital heart disease, cleft palate, and nonsyndromic congenital anomalies (07) have been associated with academic underachievement.
Neurodegenerative/neurometabolic disorders. Neurodegenerative/neurometabolic disorders are rare causes of academic underachievement. Their progressive course may not be obvious initially. Niemann Pick type C, adrenoleukodystrophy, Batten disease, and mitochondrial disorders may present with academic underachievement.
Associated or underlying disorders
Some authors question the independence of the developmental and behavioral syndromes associated with academic underachievement (32; 02). In clinical practice, the syndromes rarely exist in pure form; symptomatic overlap is the rule. For example, one third of children with attention deficit hyperactivity disorder have coexisting language disorders (04). A similar relationship is also seen in children with specific language impairment and specific reading disability (20). The large overlaps question whether the disorders are unique (comorbidity) or a differential expression of the same disorder (coexistence). Other terms, such as "developmental brain disorder" or “early symptomatic syndromes eliciting neurodevelopmental clinical examinations” (ESSENCE), are promoted to recognize the overlapping symptomatology (06; 22).