Comparison between the haematoma group and non-haematoma group
| Characteristic | Haematoma group | Non-haematoma group | χ²/Z/t | P value |
| n=55 | n=220 | |||
| Gender | χ²=0.000 | 1.000 | ||
| Male | 39 (70.91%) | 156 (70.91%) | ||
| Female | 16 (29.09%) | 64 (29.09%) | ||
| Age/(years) | 55(16) | 53(15) | Z=0.316 | 0.752 |
| BMI/ (kgm−2) | 26.15±3.20 | 24.92±3.76 | t=−1.239 | 0.219 |
| Hypertension | 13 (23.63%) | 66 (30.00%) | χ²=0.870 | 0.351 |
| Smoking history | 15 (27.30%) | 47 (21.40%) | χ²=0.880 | 0.348 |
| Anticoagulant or antiplatelet therapy | 1 (1.81%) | 13 (5.90%) | 0.315* | |
| Preoperative blood index | ||||
| PT(s) | 10.95 (0.78) | 10.60 (0.78) | Z=1.960 | 0.050 |
| INR | 1.03 (0.07) | 0.99 (0.10) | Z=1.834 | 0.067 |
| FIB (g/L) | 2.89±0.59 | 2.94±0.50 | t=0.702 | 0.483 |
| APTT(s) | 33.25±4.09 | 32.03±3.60 | t=2.557 | 0.011 |
| TT(s) | 13.95 (1.58) | 13.70 (1.10) | Z=0.992 | 0.321 |
| Platelet count (109/L) | 228 (80.50) | 220 (76.00) | Z=1.711 | 0.087 |
| Classification of cervical spondylosis | 0.060 | |||
| CSM | 35 (63.64%) | 115 (52.27%) | ||
| CSR | 6 (10.91%) | 57 (25.91%) | ||
| Other types | 14 (25.45%) | 48 (21.82%) | ||
| Preoperative m-JOA score | 14.00 (4.10) | 14.50 (3.10) | Z=−1.623 | 0.104 |
| Preoperative NDI score | 12.00 (15.30) | 11.00 (18.00) | Z=−0.726 | 0.468 |
| Surgical segments (Levels) | 2 (1) | 2 (1) | Z=1.411 | 0.158 |
| OPLL within the surgical segments | 18 (32.70%) | 67 (30.50%) | χ²=0.106 | 0.744 |
| ACCF | 23 (41.80%) | 54 (24.45%) | χ²=6.512 | 0.011 |
| Surgery duration (minutes) | 86(38) | 76(44) | Z=0.939 | 0.348 |
| EBL (mL) | 30(48) | 20(40) | Z=1.754 | 0.079 |
| Drain volume (mL) | 30.00 (48.75) | 30.00 (35.00) | Z=0.560 | 0.576 |
| Preoperative MAP (mm Hg) | 96.30 (15.05) | 97.00 (12.60) | Z=0.369 | 0.712 |
| Maximum MAP during recovery (mm Hg) | 110.00 (15.50) | 108.30 (17.88) | Z=2.159 | 0.031 |
| ASA physical status classification | 1.000* | |||
| I–II | 55 (100%) | 216 (98.60%) | ||
| ≥III | 0 (0%) | 3 (1.40%) | ||
| Hospitalisation duration (days) | 7 (7) | 4 (2) | Z=7.395 | <0.001 |
| Cost (¥) | 9 371 (3 472) | 7 883 (2 857) | Z=4.876 | <0.001 |
Data are presented as n (%) or median (IQR) or means±SD.
*Fisher’s exact test.
ACCF, anterior cervical corpectomy and fusion; APTT, activated partial thromboplastin time; ASA, American society of Aneshesiologists; BMI, body mass index; CSM, cervical spondylotic myelopathy; CSR, cervical spondylotic radiculopathy; EBL, estimated blood loss; FIB, fibrinogen; INR, international normalised ratio; MAP, mean arterial pressure; m-JOA, modified Japanese Orthopaedic Association; NDI, neck disability index; OPLL, ossification of posterior longitudinal ligament; PT, preoperative prothrombin time; TT, thrombin time.