Table 1.
Baseline characteristics of the study cohort (N=560)*
| Characteristic | Full Sample N= 560 |
Delirium N=134 |
No Delirium N=426 |
|---|---|---|---|
| Age- mean years (SD) | 76.7 (5.2) | 77.5 (5.0) | 76.4 (5.2) |
| Female- n (%) | 326 (58) | 81 (60) | 245 (58) |
| Nonwhite- n (%) | 42 (8) | 13 (10) | 29 (7) |
| Education- mean years (SD) | 15.0 (2.9) | 14.7 (3.0) | 15.1 (2.9) |
| Married- n (%) | 332 (59) | 79 (59) | 253 (59) |
| Lives Alone- n (%) | 167 (30) | 39 (29) | 128 (30) |
| Charlson Score- n (%) | |||
| 0 | 257 (46) | 54 (40) | 203 (48) |
| 1 | 139 (25) | 23 (17) | 116 (27) |
| 2+ | 164 (29) | 57 (43) | 107 (25) |
| GDS 15 score- mean (SD) | 2.5 (2.5) | 3.0 (2.8) | 2.3 (2.4) |
| GCP score- mean (SD) | 57.6 (7.3) | 54.7 (6.5) | 58.5 (7.3) |
| 3MS score- mean (SD) | 93.5 (5.4) | 91.6 (5.8) | 94.1 (5.1) |
| IQCODE – mean (SD) | 3.12 (0.24) | 3.19 (0.29) | 3.10 (0.21) |
| Impaired in ADL-n (%) | 42 (8) | 12 (9) | 30 (7) |
| Impaired in IADL-n (%) | 152 (27) | 48 (36) | 104 (24) |
| Surgery type- n (%) | |||
| Orthopedic | 454 (81) | 105 (79) | 349 (82) |
| Vascular | 35 (6) | 11 (8) | 24 (6) |
| General | 71 (13) | 18 (13) | 53 (12) |
ADL = Activities of Daily Living, impairment indicated by human assistance to complete any activity; GCP= General Cognitive Performance; GDS 15= Geriatric Depression Scale 15 point version, range (0–15), higher is worse; IADL = Instrumental Activities of Daily Living, impairment indicated by human assistance to complete any activity; 3MS = Modified Mini-Mental State Exam, range (0–100), lower indicates impairment; SD= standard deviation. IQCODE = Informant Questionnaire for Cognitive Decline in the Elderly, high scores imply greater proxy-reported cognitive change relative to 10 years previously. The Charlson comorbidity score ranged from 0–35, with scores of 2 or more indicating higher comorbidity. GDS scores were missing in 2 participants; no missing data for other variables.