Derivation cohort: univariate analysis of patient clinical variables considered potential risk factors for delirium at admission
| Variables | Delirium | No delirium | p Value |
|---|---|---|---|
| Age (years) | 83.83 (9.8) | 74.75 (13.4) | 0.000 |
| Blood pressure (mm Hg) | 127.5 (27.1) | 132.3 (26.5) | 0.22 |
| Respiratory rate (breaths/min) | 27.92 (9.6) | 24.42 (6.6) | 0.001 |
| Heart rate (beats/min) | 86.6 (23.8) | 84.06 (22.5) | NS |
| Body temperature (°C) | 36.7 (0.7) | 36.7 (0.8) | NS |
| Women (%) | 26 (50) | 171 (49.6) | NS |
| Excess alcohol intake (%) | 2 (3.8) | 19 (5.5) | NS |
| Mean length of stay in hospital (days) | 9.3 (6.6) | 8.3 (5.6) | NS |
| Admission in previous year (%) | 26 (50) | 152 (44.1) | NS |
| Admission in previous month (%) | 8 (15.1) | 45 (84.9) | NS |
Mean (SD).
NS, not significant.