Table 3.
Number (%) of in-hospital Confusion Assessment Method assessments performed and delirium incidence
| Site | Total | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | ||
| CAMs performeda | |||||||||
| Number expectedb | 862 | 639 | 824 | 672 | 586 | 506 | 668 | 888 | 5645 |
| Number performed | 734 (85.2%) | 564 (88.3%) | 795 (96.5%) | 599 (89.1%) | 523 (89.2%) | 443 (87.5%) | 611 (91.5%) | 796 (89.6%) | 5065 (89.7%) |
| AMTS performed | 734 (100.0%) | 564 (100.0%) | 795 (100.0%) | 598 (99.8%) | 523 (100.0%) | 443 (100.0%) | 611 (100.0%) | 795 (99.9%) | 5063 (100%) |
| MotYB test performed | 733 (99.9%) | 563 (99.8%) | 790 (99.4%) | 596 (99.5%) | 517 (98.9%) | 441 (99.5%) | 609 (99.7%) | 791 (99.4%) | 5040 (99.5%) |
| CAMs not performed | |||||||||
| Number not performed: | 128 (14.8%) | 75 (11.7%) | 29 (3.5%) | 73 (10.9%) | 63 (10.8%) | 63 (12.5%) | 57 (8.5%) | 92 (10.4%) | 580 (10.3%) |
| -Participant too ill | 42 (32.8%) | 17 (22.7%) | 14 (48.3%) | 9 (12.3%) | 25 (39.7%) | 16 (25.4%) | 22 (38.6%) | 41 (44.6%) | 186 (32.1%) |
| -Participant refused | 13 (10.2%) | 32 (42.7%) | 9 (31.0%) | 21 (28.8%) | 22 (34.9%) | 36 (57.1%) | 17 (29.8%) | 13 (14.1%) | 163 (28.1%) |
| -Personal or nominated consultee refused | 0 (0.0%) | 1 (1.3%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 2 (3.2%) | 0 (0.0%) | 0 (0.0%) | 3 (0.5%) |
| -Participant unavailable | 6 (4.7%) | 14 (18.7%) | 5 (17.2%) | 26 (35.6%) | 9 (14.3%) | 7 (11.1%) | 14 (24.6%) | 25 (27.2%) | 106 (18.3%) |
| -Research staff missed participant | 0 (0.0%) | 9 (12.0%) | 1 (3.4%) | 8 (11.0%) | 6 (9.5%) | 1 (1.6%) | 2 (3.5%) | 2 (2.2%) | 29 (5.0%) |
| -Ward closed | 61 (47.7%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 61 (10.5%) |
| -Other | 2 (1.6%) | 2 (2.7%) | 0 (0.0%) | 8 (11.0%) | 1 (1.6%) | 1 (1.6%) | 2 (3.5%) | 0 (0.0%) | 16 (2.8%) |
| -Missing | 4 (3.1%) | 0 (0.0%) | 0 (0.0%) | 1 (1.4%) | 0 (0.0%) | 0 (0.0%) | 0 (0.0%) | 11 (12.0%) | 16 (2.8%) |
| Participant CAM results | |||||||||
| Positive – delirium suggested (N,%) | 5 (4.8%) | 5 (6.1%) | 9 (8.6%) | 9 (10.0%) | 9 (12.9%) | 3 (4.6%) | 6 (6.5%) | 11 (10.6%) | 57 (8.0%) |
| Negative – delirium not suggested (N,%) | 99 (95.2%) | 77 (93.9%) | 96 (91.4%) | 81 (90.0%) | 61 (87.1%) | 62 (95.4%) | 87 (93.5%) | 93 (89.4%) | 656 (92.0%) |
| Incidence (95%CI) | 4.8 (0.70, 8.92) | 6.1 (0.92, 11.28) | 8.6 (3.22, 13.93) | 10.0 (3.80, 16.20) | 12.9 (5.02, 20.70) | 4.6 (0.00, 9.72) | 6.5 (1.46, 11.44) | 10.6 (4.67, 16.49) | 8.0 (6.00, 9.99) |
CAM confusion assessment method, AMTS abbreviated mental test score, MotYB months of the year backwards test
aFigures relate to 712 patients as 1 patient withdrew at baseline and no further data was provided. bThe number expected excludes assessments unavailable due to discharge, death or withdrawal