Table 4.

Comparison of the CK levels for surgery with microendoscopy or not.

Variable	Surgery method	Number of patients	Mean ± standard deviation	Median	Min	Max	Statistic	P value
Preoperative CK	With microendoscopy	22	68.68 ± 23.49	73	36	120	0.812	.419
	Without microendoscopy	90	73.7 ± 26.6	80	18	130
CK value at POD1	With microendoscopy	22	134.8 ± 60.09	118	73	286	−0.453	.652
	Without microendoscopy	90	129.6 ± 45	124	57	242
CK change at POD1	With microendoscopy	22	66.1 ± 4.94	56	−10	191	−0.968	.335
	Without microendoscopy	90	55.9 ± 4.32	49	−40	171

CK = creatine kinase, POD = postoperative day.