Table 5. Comparison of Cortical Thickness with Renal Cortical Echogenicity.

Echogenicity Grades [Grading based on ultrasound features]	Cortical Thickness (cm)
	No. of Patients	Mean	SD	95% Confidence Interval for Mean		F Value	P-Value
				Lower Bound	Upper Bound
Grade 0	60	1.100	0.0000	1.100	1.100	477.83	0.0005
Grade 1	60	1.093	0.0756	1.074	1.113
Grade 2	44	0.900	0.1034	0.869	0.931
Grade 3	24	0.462	0.1135	0.415	0.510
Grade 4	12	0.433	0.0888	0.377	0.490
Total	200	0.938	0.2531	0.902	0.973