Absolute risk: ask how often, among whom, and over what time

For a reader, the useful questions are what event the number concerns, which group it describes, and the time frame. We explain the reading task with invented nonmedical numbers. This page does not estimate anyone's health risk or reproduce the source's cancer-risk estimates.

Put a number back into its sentence

Imagine a fictional report about parcels at a community event. It records that 12 of 200 parcels were returned during a particular month. That is an observed proportion of 6% in those recorded parcels: 12 divided by 200, multiplied by 100.

“Six percent were returned” leaves important details behind. Returned parcels are not the same event as damaged parcels. The 200 parcels are not every parcel ever sent. The month is not the entire history of the event.

The arithmetic describes the invented record. It does not tell us the probability that a particular future parcel will be returned. Nor does it identify why any parcel came back. Keep the event, group, and time beside the number before making a comparison.

A reading card for a percentage

Exact event counted or estimated:
Group the number describes:
Time period:
Number of events and total, if supplied:
Is this an observed count or an estimated future chance?
What the source says about uncertainty:
Question the number does not answer:

If the report does not provide one of these details, write “not supplied here.” Do not invent a denominator or time frame to make an incomplete headline sound precise.

Keep the comparison separate

Absolute risk concerns the event's chance in the specified context. Relative risk compares risks between groups. Before deciding what a phrase such as “twice as likely” means for a reader, locate the underlying numbers rather than treating the comparison as a complete account.

When an ADHD-related headline contains a health-risk figure, follow it to the original report and keep its population and limits visible. Our parcel example is only arithmetic practice. It cannot be transferred to an ADHD diagnosis, medication decision, or a person's likely outcome.

Read together without assigning a forecast

A teen can ask what the total was without being asked to assess the study. A parent can distinguish a group figure from a statement about their own child. A partner or grandparent can help locate the time period while leaving an unresolved question unresolved. No family member needs to supply private health details to use this reading card.

Source

[1] National Cancer Institute. Absolute risk. NCI Dictionary of Cancer Terms. Publication date not stated on the inspected entry; accessed September 5, 2026. The definition supports [1]. Its disease-specific example is not reproduced or applied to ADHD; the parcel counts and reading card are original illustrations.

Related guides

• Relative risk

  : distinguish an event chance from a group comparison.

• Sample size

  : identify how much information was collected.

• Correlation

  : keep association separate from an explanation.

• Causation

  : ask what supports a claim about cause.