With NACC’s direct query system, you can create frequency tables of data from the Uniform Data Set, the Neuropathology Data Set, and the FTLD Module. These tables can help you determine quickly whether NACC is likely to have the subjects you’re looking for in numbers sufficient to address your research question. Please note that these should be used as rough, preliminary numbers; for publication purposes, a more detailed data request is required.
Many data elements used in NACC’s direct query system are derived or calculated variables that describe a combination of data elements taken directly from the UDS forms (e.g., “Age at initial visit” is derived from the subject’s birth year and month and the date of the initial UDS visit).
NOTE: Data collected using version 10 of the Neuropathology Form will be available soon. NP data sample size may be underestimated.
There are three steps to creating a frequency table: first, choose the subjects you want to include; next, select the variable(s) you want to see for those subjects; finally, choose the type of output you want (web or PDF).
Step 1: Select the subject inclusion criteria:
OPTION A — Use a subset of the UDS: In the columns below, choose one to three criteria, specifying the relationship between them as “AND” or “OR” (choose “N/A” if you don’t want to apply any criterion for a particular column).
Please note that when three criteria are selected using a combination of AND and OR, the criteria are applied to the data in the following order:
- Scenario 1: [Criterion 1 OR (Criterion 2 AND Criterion 3)]
- Scenario 2: [(Criterion 1 AND Criterion 2) OR Criterion 3]
OPTION B — Use all of the UDS: If you don’t want to focus on a specific sub-population (e.g., <65-year-olds), click "Next" to go directly to Step 2; in this case, your table will include all UDS subjects.