Table 1.
Demographic and clinical characteristics of the patients in the two groups.
| Characteristic | BIS group (n=41) | Non-BIS group (n=40) | P value |
|---|---|---|---|
| Male sex | 29 (70.7%) | 27 (67.5%) | |
| Age (years) | 68.29±2.81 | 68.90±2.99 | 0.350 |
| Body mass index (kg/m2) | 21.07±1.33 | 21.27±1.09 | 0.476 |
| Comorbidities | |||
| Diabetes | 3 (7.3%) | 4 (10.0%) | 0.757 |
| Hypertension | 7 (17.1%) | 5 (12.5%) | 0.520 |
| Education (years) | 11.46±3.00 | 11.55±3.14 | 0.899 |
| MMSE score | 29.18±0.87 | 28.97±0.89 | 0.318 |
| Anesthetic time (min) | 185.51±14.69 | 184.53±13.81 | 0.756 |
| Operation time (min) | 155.44±14.72 | 154.53±13.81 | 0.774 |
| Blood transfusion (mL) | 0 | 0 | |
| Preoperative ANT results | |||
| Alerting effect (ms) | 28.05±17.52 | 29.50±14.17 | 0.684 |
| Orienting effect (ms) | 34.68±18.77 | 35.65±18.31 | 0.815 |
| Conflict effect (ms) | 150.00±38.98 | 147.10±36.01 | 0.729 |
| Accuracy (%) | 94.27±3.73 | 93.73±3.76 | 0.517 |
| Response time (ms) | 992.98±141.07 | 985.93±140.04 | 0.822 |
| Preoperative delirium | 0 (0.0%) | 0 (0.0%) | |
Data are presented as n (%) or mean ± standard deviation. ANT – attention network test; MMSE – mini-mental state examination.