Table 4.

Comparison among three kidney-size groups of the (post-pre) kidney volume differences and percent differences in the right, left, and total kidney measurements made by two readers. The percent difference was larger when the total kidney volume was smaller

KidneyReaderSmall Kidney Group Mean (SD)Medium Kidney Group Mean (SD)Large Kidney Group Mean (SD)P valueGroup Pairwise Relationship
Volume difference (post − pre) (mL)RightR120.36 (11.48)21.09 (25.58)21.03 (17.63)0.054
R226.84 (18.54)28.06 (21.00)20.18 (25.67)0.781
LeftR116.35 (15.69)17.62 (17.63)−4.17 (21.68)0.975
R223.55 (12.54)29.85 (17.15)20.60 (15.27)0.542
TotalR136.70 (22.07)38.70 (41.51)11.51 (24.52)0.204
R250.39 (28.29)57.91 (34.14)40.78 (15.92)0.523
Volume %difference [(post − pre) pre]x100RightR18.26 (4.76)4.75 (6.09)0.06 (1.72)0.011Small > Large
R211.61 (8.80)5.94 (5.35)2.37 (2.18)0.030Small > Large
LeftR18.13 (8.00)5.93 (5.35)1.36 (1.15)0.122
R211.20 (6.75)7.71 (6.50)1.83 (1.17)0.015Small > Large
TotalR18.01 (4.90)5.07 (5.96)2.04 (2.18)0.021Small > Large
R211.16 (6.79)6.72 (5.66)1.92 (0.98)0.012Small > Large