Table 3.

Characteristics of patients with subsidence

Characteristic	Subsidence	No subsidence	p-value
Age (yr)	62.4±14.8	59.0±11.8	0.522
Male sex	6 (85.7)	19 (79.2)	0.587
Level of fusion			0.450
C3–5	5	9
C4–7	2	8
C5–8	0	6
Japanese Orthopaedic Association score
Preoperative	10.9±2.0	9.80±2.3	0.283
3 mo	13.8±2.6	13.0±2.0	0.522
6 mo	13.0±2.8	13.4±2.1	0.814
1 yr	13.0±2.8	13.4±2.2	0.841
2 yr	13.0±2.8	13.5±2.0	0.617

Values are presented as mean±standard deviation or number (%).