TABLE 2.
Number and frequency of transitions between cognitive states in the Nun Study, United States, 1991–2002 (1,905 transitions in 470 subjects)
| Prior cognitive state |
||||||
|---|---|---|---|---|---|---|
| Current cognitive state |
Intact cognition |
Mild cognitive impairments |
Global impairment |
|||
| No. | % | No. | % | No. | % | |
| Intact cognition | 436 | 65.3 | 138 | 14.5 | 12 | 4.2 |
| Mild cognitive impairments | 155 | 23.2 | 551 | 58.1 | 30 | 10.4 |
| Global impairment | 39 | 5.8 | 110 | 11.6 | 113 | 39.2 |
| Dementia | 6 | 0.9 | 71 | 7.5 | 60 | 20.8 |
| Dead | 32 | 4.8 | 79 | 8.3 | 73 | 25.4 |
| Total | 668 | 100 | 949 | 100 | 288 | 100 |