Table 2.

(Top) Manual and automated stone diameter measurements, mean ± SD (range) (mm), with variability between the SLD/ULD series. (Bottom) Variability between manual measurements (Reader 1/Reader 2, left) and variability between automated measurements when repeated (Automated, right). SD = standard deviation

Stone Diameter
	Reader 1	Reader 2		Automated
SLD	7.9 ± 6.2 (2.6–30.5)	7.3 ± 6 (2.4–30.7)		9.3 ± 6.4 (3.7–33.1)
ULD	7.3 ± 6 (2.5–30.5)	7.2 ± 6.1 (2.1–30.7)		9.1 ± 6.4 (4.2–32.8)
SLD-ULD Variability	8.1%	8.2%		5.2%
	Reader 1/Reader 2 Variability		Automated Variability
SLD-SLD	8.6%		0%
ULD-ULD	7.8%		0%