Table 5. Paired Samples t-Test to compare pre and post-operative serum creatinine during both pre-& post-intervention phases.

	N	Mean	SD	Difference mean	P-value
Pre-intervention phase					0.000*
Pre-operative blood Cr	105	0.587	0.181	0.037
Post-operative blood Cr	105	0.625	0.255
Post-intervention phase					0.000*
Pre-operative blood Cr	112	0.671	0.177	-0.02
Post-operative blood Cr	112	0.65	0.166

Significant difference < 0.05 according to paired t-test. Cr=creatinine. SD= Standard deviation