Why Are My Child’s Dyslexia Test Scores So Different?
Updated: Oct 28
A profile is more informative than a single score
A dyslexia assessment may show that a child has strong verbal reasoning but finds spelling unusually difficult. Another child may understand spoken explanations well yet read unfamiliar words slowly. These contrasts can be useful: they help explain why everyday learning is easier in some circumstances than others.
However, a large gap between two numbers is not, on its own, proof of dyslexia. The assessor must interpret the pattern alongside the child's developmental history, reading and spelling attainment, classroom experiences and the conditions of testing.
First ask what each task actually required
A score labelled 'language' may come from choosing a picture to match a spoken word, explaining a word aloud or answering a question after listening. Those are related but different tasks. One requires recognition, another retrieval and spoken expression; a third adds comprehension and attention demands.
Reading tasks also vary: recognising familiar printed words, decoding unfamiliar words, reading accurately under time pressure and understanding a passage are not interchangeable. Before comparing scores, ask the assessor to explain the demands of each task in ordinary language.
The same child may perform differently across conditions
Consider a pupil who can work out most words correctly when allowed time but completes very few during a timed reading task. The two results may reflect a difference between accuracy and fluency, not a contradiction.
Equally, a pupil may speak confidently about a topic but struggle to put the same ideas into a written paragraph because spelling, sentence construction and handwriting all compete for attention. These examples illustrate possible patterns; they are not diagnostic shortcuts.
Check whether the difference is meaningful
Standardised test scores contain measurement uncertainty. Two scores that look different may not represent a reliable difference. Overlapping confidence intervals can be a useful warning against overinterpretation, but overlap alone is not a formal test of whether two scores differ significantly.
The assessor should use the test manual’s comparison procedures where available and consider whether the tasks measure comparable skills. Some tests provide formal guidance on comparing subtests or composite scores. A responsible report should not call every apparent gap a significant weakness. It should explain why a difference matters, if it does, and whether the tests are sufficiently comparable to support that conclusion.
A composite can hide an important contrast
A composite combines performance across tasks. It can be useful as a summary, but it may conceal uneven skills. For example, if a pupil performs much more strongly on one vocabulary task than another, the combined score does not tell you which type of language demand was easier.
The report should explain the component results rather than treating the composite as the whole story. It should also consider whether an unusually low result might have been influenced by uncertainty, fatigue, unfamiliar vocabulary or reluctance to guess.
Look for a consistent story across evidence
The strongest interpretation links results with what is known about the child. Does slow timed reading match teachers' accounts of needing longer for texts? Does weak spelling appear in independent writing, not just a test?
Is there a history of difficulty learning sound–letter relationships? Conversely, if a low score appears nowhere else, it deserves careful consideration rather than being accepted uncritically. The aim is to understand how the pattern affects learning and which supports are justified.
Questions worth asking at feedback
Ask: Which differences are meaningful and which are within expected variation? What does the lowest task actually measure? Do the findings match schoolwork and home experience?
How much confidence should we place in the composite? What are the most important implications for teaching? A clear assessor should be able to answer without relying on technical labels alone.
What parents can do next
Make a short list of two or three real difficulties that the assessment helps explain, alongside the child's strengths. Share those with the class teacher or SENCo and agree specific actions, such as explicit spelling teaching or allowing more time to read complex instructions.
Review whether the adjustments help. A profile is valuable when it changes understanding and provision, not merely because it contains an interesting pattern of numbers.