Table 3. P values of possible prognostic factors.

	1-year postoperative	5-year postoperative
Age	0.06	0.01
Sex	0.63	0.95
BMI	0.47	0.69
Symptom duration	0.59	0.65
Baseline mJOA	0.55	0.37
Myelopathy grade	0.7	0.5