Vitalnet Age-Adjusted BRFSS Percents



Rationale: To compare risk or prevalence between populations with different age structures, it is generally recommended to adjust for age. Age-adjusted rates are used to compare death rates between populations. When possible, Healthy People 2010 and 2020 Objectives with BRFSS data use age-adjustment.

Example: Without age-adjustment, analyses can be misleading or incorrect. Here is a real-world example:

- Percent Yes (Not Age-Adjusted) (Not AA)
- Percent Yes (Is Age-Adjusted) (Is AA)

Summary table showing the differences:

Ever had diabetes (excluding pregnancy)?
Race Weighted % Yes
Not AA Is AA
White 7.1% 6.4%
Black 12.1% 12.9%
Hispanic 8.0% 11.4%

If age-adjusted, Hispanic (11.4%) - White (6.4%) = 5.0%
If not age-adjusted, Hispanic (8.0%) - White (7.1%) = 0.9%



Status: We have added age-adjusted percents to Vitalnet Table and Map Maker. This lets you quickly and reliably do BRFSS age-adjusted analyses, with:

- No programming knowledge required.
- Assurance of correct, fully documented results.
- Publication-ready results produced in about a minute.

Verification: By comparing with (the few) existing age-adjusted analyses from other sources, we verified Vitalnet is producing correct BRFSS age-adjusted percents.

Confidence intervals: We plan to add confidence intervals (using Jackknife replication) to the BRFSS age-adjusted percents, within the next few months.

Population standard: We use distribution #10 from Klein and Schoenborn (2001). Other standards can be built in as you specify.

Contact us if you have suggestions / comments, or if you would like to discuss licensing BRFSS Table and Map Maker to make better use of your data.