A prospective, randomized controlled, double-blinded study comparing dexmedetomidine and clonidine as an adjuvant to ropivacaine in femoral nerve block for postoperative analgesia in patients undergoing total knee arthroplasty

Ain-Shams Journal of Anesthesiology

Table 3 Comparison of NRS scores in both groups

NRS	Group 1	Group 2	P value (unpaired t-test)
0 min	4.5 ± 0.599	4.53 ± 0.599	0.852
4 h	0 ± 0	0.4 ± 0.744	0.001
8 h	0 ± 0	1.75 ± 1.463	< 0.001
12 h	0.83 ± 1.13	2.9 ± 1.194	< 0.001
16 h	2.15 ± 1.642	2.95 ± 0.959	0.009
20 h	2.58 ± 1.279	2.78 ± 0.62	0.376
24 h	2.03 ± 0.891	2.88 ± 0.686	< 0.001