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To create a larger, more representative community comparison sample of the Brief Test of Adult Cognition by Telephone (BTACT) data to facilitate assessment of cognitive function in research studies. National US community-based survey. In total, 6747 healthy adults aged 23 to 84 years (53% female; mean age = 55 years, SD = 13). Secondary data analysis of BTACT data collected from the National Survey of Midlife Development in the United States (MIDUS) II and MIDUS Refresher cohorts. The BTACT, a brief (15-20 minute) measure of global cognit