Comparison of clinical outcomes of expansive open-door laminoplasty with unilateral or bilateral fixation and fusion for treating cervical spondylotic myelopathy: a multi-center prospective study

Table 1 Clinical characteristics of patients

Parameters	Unilateral n = 33	Bilateral n = 77	All patients	p
Gender, n (%)				0.212
Male	24 (72.73)	64 (83.12)	88 (80.00)
Female	9 (27.27)	13 (16.88)	22 (20.00)
Age (yr), mean ± s.d.	58.73 ± 10.59	61.32 ± 11.07	60.55 ± 10.95	0.225
Minimum-Maximum	40–80	40–81	40–81
BMI (kg/m²), mean ± s.d.	25.87 ± 2.89	25.09 ± 2.84	25.34 ± 2.86	0.205
Minimum-Maximum	20.7–35.49	18.37–32.87	18.37–35.49
Follow-up time (month), mean ± s.d.	13.00 ± 7.52 3–36	13.87 ± 10.30 3–36	13.61 ± 9.53 3–36	0.791
Minimum-Maximum
Segmental instability, n (%)	10 (30.30)	22 (28.57)	32 (29.09)	0.855

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