Table 1.
Patient demographics.
| Measure | All patients (n=23,006) | Training set (n=18,495) | Testing set (n=4511) | One or more positive CAMa (n=4583) | All CAM negative (n=18,423) |
| Age (years), mean (SD) | 65.5 (17.3) | 65.5 (17.3) | 65.5 (17.2) | 69.8 (16.1) | 64.4 (17.4) |
| Male, n (%) | 12,502 (54.3) | 10,037 (54.3) | 2465 (54.6) | 2614 (57) | 9888 (53.7) |
| Female, n (%) | 10,500 (45.6) | 8455 (45.7) | 2045 (45.3) | 1968 (42.9) | 8532 (46.3) |
| Patients with at least one positive CAM screen, n (%) | 4583 (19.9) | 3656 (19.8) | 927 (20.5) | 4583 (100) | 0 (0) |
| CAM evaluations per patient, mean (SD) | 12.6 (17.9) | 12.5 (18.0) | 12.9 (17.6) | 24.8 (29.0) | 9.5 (12.0) |
| Percent of positive CAM screens per patient, mean (SD) | 8.3 (22) | 8.3 (22) | 8.3 (22) | 42 (33) | 0 (0) |
| CAM evaluation days per patient, mean (SD) | 8.1 (11.1) | 8.1 (11.3) | 8.3 (10.5) | 15.6 (18.0) | 6.2 (7.6) |
| Percent positive CAM days, mean (SD) | 8.1 (21) | 8.1 (21) | 8.2 (21) | 40.8 (31) | 0 (0) |
aCAM: Confusion Assessment Method.