Table 1.

The general data and the clinical diagnoses of all patients

General data and diagnosis	Mean ± SD (Range)/N (%)
General data
Age	58.2 ± 11.1 (26–75 y)
Male/Female	71/34
Height	168.9 ± 8.4 (140–180 cm)
Weight	71.4 ± 14.1 (42–98 kg)
BMI	24.9 ± 4.1 (15–34)
Operation time	164.8 ± 39.3 (110–300 min)
Bleeding volume	232.2 ± 179.5 (150–900 ml)
Diagnosis (n, %)
Cervical spondylotic myelopathy	63 (60.0%)
OPLL	13 (12.4%)
Cervical disk herniation	6 (5.7%)
Congenital anomaly of cervical spine	4 (3.8%)
Atlantoaxial subluxation	12 (11.4%)
Others	7 (6.7%)
Type of surgery (n, %)
ACDF	19 (18.1%)
PCDF	78 (74.3%)
Laminectomy	8 (7.6%)

OPLL Ossification of posterior longitudinal ligament, ACDF Anterior cervical decompression and fusion, PCDF Posterior cervical decompression and fusion