Table 1. Baseline characteristics of Sydney and Edinburgh Delirium Study groups.
| Sydney Delirium Study | Delirium, mean+s.d. | Dementia, mean+s.d. | P-valuea |
|---|---|---|---|
| Age | 80.3±9.0 | 83.1±5.8 | 0.364 |
| Sex (F:M) | 4:8 | 9:6 | 0.161 |
| Mini-mental state exam (/30) | 15.6±4.4 | 21.5±4.6 | 0.008 |
| Informant questionnaire on cognitive decline (/5) | 4.0±0.6 | 3.7±0.4 | 0.078 |
| Confusion assessment method | 6.1±1.3 | 0.0±0.0 | <0.001 |
| Delirium index | 15.6±4.8 | 2.9±1.4 | <0.001 |
| APACHE III (acute physiology and chronic health evaluation III) index | 47.6±23.2 | 30.6±3.6 | 0.028 |
| Geriatric Depression Scale (/15) | 5.6±1.4 | 6.7±2.5 | 0.248 |
| Barthel score (/20) | 17.4±3.8 | 19.1±1.8 | 0.186 |
| Instrumental activities of daily living (/12) | 6.1±4.1 | 8.5±2.7 | 0.100 |
| Charlson comorbidity index | 6.25±2.5 | 6.4±2.9 | 0.920 |
| Edinburgh Delirium Study | Delirium, mean+s.d. | Normal controls, mean+s.d. | P-value |
|---|---|---|---|
| Age | 83.6±10.1 | 81.1±10.84 | 0.685 |
| Sex (F:M) | 3:2 | 7:1 | 0.640 |
| Mini-mental state exam (/30)b | 19.6±10.5 | 26.9±1.8 | 0.198 |
| Informant questionnaire on cognitive decline (/5) | 3.3±0.4 | 3.1±0.1 | 0.289 |
| Postoperative DRS-R98b | 19.6±9.1 | 5.3±1.9 | 0.025 |
| APACHE II (acute physiology and chronic health evaluation II) index6 | 9.4±2.3 | 7.3±1.2 | 0.11 |
| Lawton instrumental activities of daily living | 5.2±2.3 | 6.9±1.1 | 0.19 |
a
All demographics data were compared using a two-tailed t-test, except for sex distribution, which was tested using the Fisher's exact test variant of the χ2.
b
Postoperative day 1 MMSE and DRS-R98 are shown here for the Edinburgh delirium study.