Table 4.
Important variables at onset (year 0) Total Gain (N) is 22,040,569.
| Variable type | Variable name | Gain, n | Percent gain | Cumulative percent gain |
| cls | Dementia and Alzheimer dementia | 3,298,549 | 15.0 | 15.0 |
| cls | Memory loss and memory issues | 2,833,536 | 12.9 | 27.8 |
| idv | Dementia | 2,162,843 | 9.8 | 37.6 |
| idv | memory_issues | 1,525,697 | 6.9 | 44.6 |
| idv | memory_loss | 1,498,113 | 6.8 | 51.4 |
| idv | mild_cognitive_impairment | 459,131 | 2.1 | 53.4 |
| idv | Forgetful | 419,780 | 1.9 | 55.3 |
| cls | Alzheimer disease and other family memory issues | 382,811 | 1.7 | 57.1 |
| ETG | Neurological diseases signs and symptoms | 378,955 | 1.7 | 58.8 |
| idv | cognitive_impairment | 346,991 | 1.6 | 60.4 |
| idv | Memory | 337,701 | 1.5 | 61.9 |
| ICD | Altered mental status | 275,533 | 1.3 | 63.2 |
| idv | memory_lapses | 256,076 | 1.2 | 64.3 |
| idv | short_term_memory_loss | 252,683 | 1.1 | 65.5 |
| CPT | Neuropsychological testing (eg, Halstead-Reitan neuropsychological battery, Wechsler memory scales, and Wisconsin card sorting test), per hour of the psychologist’s or physician’s time, both face-to-face time administering tests to the patient and time interpreting these test results and preparing the report | 245,279 | 1.1 | 66.6 |
| cls | Cognitive impairment and hearing impairment | 232,700 | 1.1 | 67.6 |
| idv | Alzheimers_disease | 221,324 | 1.0 | 68.6 |
| cls | Cognitive issues and cognitive disorder | 214,553 | 1.0 | 69.6 |
| ETG | Mood disorder, depressed | 214,171 | 1.0 | 70.6 |
| CPT | Magnetic resonance (eg, proton) imaging, brain (including brain stem); without contrast material | 213,180 | 1.0 | 71.5 |
| ICD | Unspecified persistent mental disorders due to conditions classified elsewhere | 174,643 | 0.8 | 72.3 |
| cls | Memory lapses and concentrating | 163,176 | 0.7 | 73.1 |
| idv | getting_lost | 159,014 | 0.7 | 73.8 |
| CPT | Computed tomography, head or brain; without contrast material | 150,658 | 0.7 | 74.5 |
| cls | Family dementia and memory disturbance | 125,350 | 0.6 | 75.1 |
| ETG | Psychotic and schizophrenic disorders | 121,595 | 0.6 | 75.6 |
| dem | Age | 118,598 | 0.5 | 76.1 |
| RXG | Atypical antipsychotics | 115,677 | 0.5 | 76.7 |
| ETG | Mental disorders, organic and drug-induced | 114,621 | 0.5 | 77.2 |
| cls | Pain and tenderness | 106,109 | 0.5 | 77.7 |
| CPT | Neuropsychological testing (eg, Halstead-Reitan neuropsychological battery, Wechsler memory scales, and Wisconsin card sorting test), with qualified health care professional interpretation and report, administered by technician, per hour of technician time, face-to-face | 100,425 | 0.5 | 78.1 |
| dem | Number of encounters | 94,671 | 0.4 | 78.6 |
| RXG | Selective serotonin reuptake inhibitors | 93,374 | 0.4 | 79.0 |
| OFam | informant | 92,567 | 0.4 | 79.4 |
| idv | relaxing_issues | 84,741 | 0.4 | 79.8 |
| ICD | Depressive disorder, not elsewhere classified | 77,831 | 0.4 | 80.1 |