Comparison of the Application Value for Diagnosis of Chronic Kidney Disease between Color Doppler Flow Quantification Technique and Computed Tomography

Table 2

Comparison of various measurement indexes of 640-slice volume CT scan among various groups (Mean ± SD).

Group	n	CT values in the lag phase (HU)	CT values in the cortical phase (HU)	CT values in the medullary phase (HU)
Control	32	145.13 ± 5.05	206.38 ± 8.63	181.47 ± 6.01
Stage 1	23	135.13 ± 4.99^a	179.57 ± 3.55^a	172.09 ± 5.99^a
Stage 2	20	127.90 ± 5.17^ab	158.05 ± 3.89^ab	161.25 ± 6.60^ab
Stage 3	16	120.44 ± 4.94^abc	140.56 ± 7.48^abc	152.69 ± 5.92^abc
Stage 4	13	114.31 ± 2.63^abcd	131.54 ± 4.27^abcd	137.23 ± 4.88^abcd
Stage 5	16	97.44 ± 5.91^abcde	117.38 ± 5.54^abcde	122.94 ± 5.79^abcde

a indicates versus control group; b indicates versus stage 1 group; c indicates versus stage 2 group; d indicates versus stage 3 group, and e indicates versus stage 4 group.