The bracketed range you see after a score on an assessment report is a confidence interval, and it's the honest version of the number. It says: our best single estimate is this, and the true value very likely sits somewhere inside this band. It's there on purpose, and psychologists told me they'd rather you read it than the point estimate beside it.
I'm not a clinician. This is a measurement question rather than a clinical one, which is why I can write about it — and it's the item on a report that I think is most often skipped by exactly the readers it was put there for.
The range isn't the report hedging. It's the report being accurate about precision.
Why is there a range at all?
Because every measurement has some imprecision, and pretending otherwise would be the less honest choice.
An assessment result is a sample of how someone performed on particular tasks, on a particular day, in a particular room, with a particular person. Run it a week later and the number would very likely land somewhere close but not identical. That variation isn't a flaw in the assessment; it's a property of measuring anything about people.
The interval is the report's way of representing that. Rather than implying the number is exact, it gives you the neighbourhood the result sits in. Psychologists include it because a bare number invites a precision the measurement doesn't have.
How should I read the range?
Read it as the answer, and the single number as shorthand.
If a report gives a score with a range around it, the useful mental move is to think of the whole band as "the result", not the midpoint. Two consequences follow that are worth knowing.
Overlapping ranges usually mean "similar". If two areas produce different numbers but their bands overlap substantially, the report will typically treat them as comparable — because the measurement can't reliably tell them apart. If it does that, it isn't being evasive.
A wide band means less certainty about that specific result. Bands aren't always the same width. A wider one is telling you the estimate is less precise, which is genuinely useful information rather than a defect.
Why do psychologists wish more people read it?
Because the point estimate gets treated as a fact about a person, and the range is the built-in correction.
More than one psychologist told me a version of the same story: a family fixes on one number, carries it around, and repeats it years later as though it were a fixed characteristic — when the report itself said, right there in brackets, that the result sat somewhere in a band and reflected one day's performance.
They also mentioned the reverse. Someone sees a small difference between two areas and reads significance into it that the intervals rule out. The range is what prevents both readings, and it only works if someone looks at it.
The point estimate gets remembered for years. The bracket beside it is the correction.
Does a wide range mean the assessment was poor?
No, and this is worth saying plainly because it's a reasonable thing to wonder.
Interval width depends on properties of the measurement itself and on how the result was obtained — not on how carefully the clinician worked. Some kinds of result are inherently estimated more precisely than others. A report that shows you a wider band on one item is being transparent about that difference rather than confessing to sloppiness.
What would be a problem is a report giving a single unqualified number for everything. That's the version that looks more authoritative and tells you less.
What does this change about the rest of the report?
It should shift where you spend your attention.
If the numbers come with bands, then the fine-grained differences between them carry less weight than they appear to, and the interpretive sections carry more. The clinician's account of what the overall pattern means — written knowing exactly how precise each input was — is the part that survives the uncertainty. That's the section worth your time.
There's a fuller explanation of the two ways results get expressed in what standard scores mean on a report and what 'percentile' means on an assessment report. And if a range in your own report is confusing, the clinician who wrote it is the right person to ask — every one I've spoken to would rather explain it than have it skipped.
For clinicians: this is written to be sendable, because the same question comes back to you on report after report. The write-up itself is the part our drafting is built to give back.
— Ian
