Table 1.
Comparison of demographic characteristics between between the old group (65 to <75 years) vs. the elderly group (75 to 85 years).
| Group | Old Group | Elderly Group | p-Value |
|---|---|---|---|
| n | 52 | 47 | |
| Preoperative variables | |||
| Age (years) | 68.8 ± 3.3 | 78.1 ± 3.0 | <0.001 |
| Sex | 0.666 | ||
| Male | 2 (3.8%) | 3 (6.4%) | |
| Female | 50 (96.2%) | 44 (93.6%) | |
| ASA physical class | 0.244 | ||
| I | 3 (5.8%) | 0 (0.0%) | |
| II | 49 (94.2%) | 47 (100.0%) | |
| Body mass index (kg/m2) | 25.2 ± 3.8 | 24.5 ± 2.5 | 0.288 |
| Height (m) | 1.6 ± 0.1 | 1.5 ± 0.1 | 0.332 |
| Weight (kg) | 61.4 ± 9.2 | 58.9 ± 7.0 | 0.145 |
| Intraoperative variables | |||
| Operation duration (min) | 79.9 ± 22.4 | 74.4 ± 12.9 | 0.131 |
| Anesthesia duration (min) | 112.0 ± 23.8 | 107.2 ± 16.2 | 0.25 |
| Tourniquet time (min) | 47.2 ± 14.6 | 48.6 ± 15.4 | 0.647 |
| Remifentanil | |||
| Total dosage (mg) | 0.5 ± 0.2 | 0.4 ± 0.2 | 0.177 |
| Postoperative variables | |||
| Total PCA infusion (mL) | 48.0 ± 21.6 | 47.8 ± 25.6 | 0.973 |
Abbreviations: ASA, American Society of Anesthesiologists; PCA, patient-controlled analgesia. Values are expressed as mean (standard deviation) and number (percentage).