Delay-Adjusted Rates in SEER*Stat

In the April 2025 release of the 1975-2022 SEER Research Data, delay-adjusted rates (age-specific and age-adjusted) can be computed in SEER*Stat using delay-adjustment factors derived from the December 2024 NAACCR submission. Delay adjustment factors and rates can be produced for standard SEER registry groups in SEER Research Data and any combinations of registries in SEER Research Plus data. The delay-adjusted and unadjusted rates presented in the SEER*Explorer can be obtained from these databases.

The SEER*Stat databases provide delay factors specific to a cancer site, registry, age group, race, ethnicity, and year of diagnosis. For any aggregates of these stratums, SEER*Stat produces delay adjusted rates by weighting individual cases by their delay factors. The variances of the composite delay-adjusted, age-adjusted rates are obtained by assuming that the delay factors are constants and cases follow Poisson distribution. SEER*Stat provides “composite” delay factors by dividing the delay adjusted rates by the unadjusted rates.

Available Delay Databases

In addition to the standard delay databases available with the SEER Research Data described above, additional databases are available for users with access to the Research Plus data. These include:

• Delay Databases with Individual Registry Identifiers
• Delay Databases by Stage for Prostate and Breast (Female only) Cancers