Histograms of cognitive test scores including Modified Mini Mental Status Examination (3MSE), California Verbal Learning Test II (CVLT) short form long/free-recall test, Weschler Adult Intelligence Scale (WAIS) digit coding subtest, and Controlled Oral Word Association (COWA) f,a,s subtest among elderly American Indians, showing score density (Y-axis) with a Gaussian distribution overlay (blue curve). Mean scores overall were approximately: 3MSE (88), CVLT long free recall (5), WAIS coding (44), and COWA (24).