Wound infiltration with ropivacaine as an adjuvant to patient controlled analgesia for transforaminal lumbar interbody fusion: a retrospective study

Table 2 The administration of flurbiprofen axetil in two groups

Period	Ropivacaine group	Control group	P value
First 4 h	5/60	8/52	0.245
From 4 to 8 h	10/60	19/52	0.017
From 8 to 12 h	6/60	11/52	0.101

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