Table 2. Demographic characteristics and perioperative data.
| I [0, 60%) | II [60%, 70%) | III [70%, 80%) | IV [80%, 100%] | P value | |
|---|---|---|---|---|---|
| Patients (n) | 66 | 63 | 53 | 72 | |
| Age (year), median (IQR) | 65 (53, 75) | 66 (54, 77) | 64 (50, 71) | 63.5 (52, 74) | 0.300 |
| Sex (male/female) | 39/27 | 31/32 | 31/22 | 39/33 | 0.644 |
| BMI (kg/m2), (mean ± SD) | 22.8 ± 2.9 | 21.4 ± 3.2 | 23.1 ± 3.0 | 22.4 ± 3.1 | 0.014 |
| ASA grade | 0.042 | ||||
| II | 39 | 39 | 41 | 56 | |
| III | 26 | 24 | 12 | 15 | |
| IV | 1 | 0 | 0 | 1 | |
| Diabetes mellitus | 6 | 9 | 8 | 5 | 0.384 |
| Hypertension | 21 | 19 | 12 | 22 | 0.702 |
| CHD | 8 | 7 | 4 | 3 | 0.313* |
| COPD | 3 | 7 | 5 | 5 | 0.655* |
| General anaesthesia/combined TAP block | 51/15 | 50/13 | 22/31 | 12/60 | < 0.001 |
| Site of procedure (colon/rectal) | 41/25 | 43/20 | 36/17 | 58/14 | 0.113 |
| Preoperative hemoglobin (g/L), (mean ± SD) | 121.4 ± 23.2 | 117.3 ± 21.6 | 122.2 ± 22.9 | 116.0 ± 23.8 | 0.356 |
| Length of operation (min), median (IQR) | 230 (200, 293) | 235 (215, 275) | 255 (187, 315) | 240 (192, 279) | 0.706 |
| Intraoperative blood loss (ml), median (IQR) | 100 (50, 200) | 100 (50, 200) | 100 (50, 100) | 80 (30, 100) | 0.003 |
| Intraoperative net fluid input (ml), (mean ± SD) | 1897.7 ± 680.7 | 1732.2 ± 658.9 | 1555.7 ± 637.9 | 1538.3 ± 575.9 | 0.004 |
BMI: body mass index; ASA: American Society of Anesthesiologists; CHD: coronary heart disease; COPD: chronic obstructive pulmonary disease; IQR: interquartile range; SD: standard deviation.
*Fisher exact test, all other statistics: Chi-Square test.