Table 3 Intra- and perioperative factors monitored across time
|  | Before, n = 279 | After, n = 242 | P-value |
|---|---|---|---|
Operation time, min | 103.0 (25.5) | 104.9 (28.6) | 0.42 |
Peripheral nerve block, n (%) | 192 (68.8) | 164 (67.8) | 0.80 |
Spinal anaesthetic (+/− other), n (%) | 242 (86.7) | 211 (87.2) | 0.88 |
Patient controlled anaesthesia, n (%) | 240 (86.0) | 181 (74.8) | < 0.001 |
Use of tranexamic acid, n (%) | 250 (89.6) | 226 (93.4) | 0.13 |
Use of indwelling catheter, n (%) | 278 (99.6) | 241 (99.6) | 0.92 |
Tourniquet (knee only), n (%) | 205 (95.8) | 168 (97.1) | 0.49 |
Donor blood transfusion, n (%) | 6 (2.2) | 13 (5.5) | 0.05 |
Intensive care/high dependency unit admission, n (%) | 16 (5.8)) | 11 (4.5) | 0.54 |
Day of surgery, n (%) | 0.88 | ||
 Monday | 38 (13.6) | 27 (11.2) | |
 Tuesday | 80 (28.7) | 70 (28.9) | |
 Wednesday | 52 (18.6) | 52 (21.5) | |
 Thursday | 33 (11.8) | 29 (12.0) | |
 Friday | 76 (27.2) | 64 (26.4) | |
Morning surgeries (A.M start), n (%) | 195 (70.1) | 172 (71.1) | 0.82 |