Predicting the chemical composition of urinary calculi in vivo using gray scale ultrasound

BMC Urology

Table 2 Differences in demographics and clinical outcomes of four types of urinary calculi

Variable	P-value
Variable	Whewellite calculi vs. weddellite calculi	Whewellite calculi vs. carbonate apatite calculi	whewellite calculivs vs. uric acid anhydrous calculi	Weddellite calculi vs. carbonate apatite calculi	Weddellite calculi vs. uric acid anhydrous calculi	Carbonate apatite calculi vs. uric acid anhydrous calculi
Age (years)	0.844a	0.001a	0.037a	0.011a	0.177a	<0.001a
Sex	0.014a	0.006a	0.805a	0.932a	0.037a	0.024a
BMI (kg/m²)	0.668a	0.727a	0.807a	0.910a	0.717a	0.815a
Right/Left side	0.502a	0.914a	0.414a	0.661a	0.269a	0.492a
Location	0.172a	0.122a	0.886a	0.945a	0.338a	0.287a
Ipsilateral hydronephrosis	0.544b
Calculi size on NCCT (cm)	0.817b	0.002b	<0.001b	0.041b	0.014b	0.679b
HU value	0.539a	0.034a	<0.001a	0.045a	<0.001a	<0.001a
Calculi size on ultrasound (cm)	0.189b
Grayscale value of calculi on ultrasound	0.549a	0.447a	0.005a	0.928a	0.012a	0.007a
Grayscale value of posterior acoustic shadow on ultrasound	0.372a	0.069a	0.284a	0.527a	0.144a	0.030a
Width of posterior acoustic shadow on ultrasound (cm)	0.328b
Length of posterior acoustic shadow on ultrasound (cm)	0.320b	0.005b	0.703b	0.212b	0.296b	0.017b

a. Based on one-way ANOVA
b. Based on non-parametric tests
BMI, body mass index; NCCT, non-contrast computed tomography; HU, Hounsfield units

ISSN: 1471-2490