Table 6.

Comparison of CK level among different segment of ACDF.

Variable	Group	Number of patients	Mean ± standard deviation	Median	Min	Max	F value	P value
Preoperative CK	1ACDF	35	69.2 ± 22.17	69	32	112	1.58	.185
	2ACDF	26	83.3 ± 21.29	88	36	114
	3ACDF	8	64.38 ± 33.78	58.5	33	120
CK value at POD1	1ACDF	35	105.9 ± 36.27	98	57	213	5.526	4.399 × 10–4
	2ACDF	26	145.3 ± 32.27	141	92	214
	3ACDF	8	172.5 ± 80.8	159.5	85	286
CK change at POD1	1ACDF	35	36.7 ± 42.95	28	−40	171	6.194	1.601 × 10–4
	2ACDF	26	62 ± 24.89	57	32	114
	3ACDF	8	108.13 ± 50.44	103	48	191

ACDF = anterior cervical discectomy fusion, CK = creatine kinase, POD = postoperative day.