表 2.

Comparison of ASIA grade between 2 group at pre- and post-operation

手术前后两组 ASIA 脊髓神经损伤等级比较

组别 Group	术前 Preoperative				末次随访 Last follow-up
	C 级 Grade C	D 级 Grade D	E 级 Grade E		C 级 Grade C	D 级 Grade D	E 级 Grade E
经皮组 Percutaneous group	2	10	9		0	2	19
开放组 Open group	3	13	6		0	2	20
统计值 Statistic	Z=1.030 P=0.303				Z=0.480 P=0.961