Table 3.

Severity of back pain in the three groups at different times.

Time of evaluation	Methyl prednisolone	Bupivacaine	Normal saline
Before operation	4.14±0.27	4.06±0.31	4.30±0.27
24 h after operation	4.64±0.22	4.88±0.24	4.38±0.21
48 h after operation	3.84±0.17	3.48±0.20	4.08±0.22
72 h after operation	3.22±0.17	3.04±0.16	3.02±0.18
96 h after operation	2.32±0.14	1.04±0.17	2.18±0.14
	P=0.948 between three groups

Values are mean+SD