| Delirium severity | Mild | Moderate | Severe | Kruskal-Wallis |
| Reduced consciousness/awareness | 1.50 (1-2, SD 0.52) | 1.79 (1–3, SD 0.53) | 2.59 (SD 0.51) | : , | Disorientation | 1.42 (1-2, SD 0.52) | 2.27 (1–3, SD 0.53) | 2.94 (2-3, SD 0.24) | : , | Short term memory impairment | 1.00 (1, SD 0) | 2.00 (1–3, SD 0.89) | 2.88 (2-3, SD 0.33) | : , | Impaired digit span | 1.75 (1-2, SD 0.45) | 2.44 (1–3, SD 0.53) | 3.00 (3, SD 0) | : , | Reduced ability to maintain/shift attention | 1.67 (1-2, SD 0.49) | 2.07 (1–3, SD 0.49) | 2.88 (2-3, SD 0.33) | : , | Disorganized thinking | 1.67 (0–3, SD 0.49) | 1.93 (1–3, SD 0.66) | 2.82 (2-3, SD 0.39) | : , | Perceptual disturbances | 1.25 (0–2, SD 0.97) | 1.06 (0–3, SD 1.12) | 1.06 (0–3, SD 1.03) | ns | Delusions | 0.58 (0–2, SD 0.67) | 0.89 (0–3, SD 0.87) | 1.29 (0–3, SD 1.05) | ns | Psychomotor abnormality | 2.00 (1-2, SD 0.42) | 2.15 (1–3, SD 0.47) | 2.65 (2-3, SD 0.49) | : , | Sleep-wake cycle disturbance | 2.00 (1-2, SD 0.60) | 2.01 (1–3, SD 0.52) | 2.41 (1–3, SD 0.61) | : , |
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