Table 1.

Angles of Deflection

		X2		XC
		Mean	SD	Mean	SD	t test P value
Empty	Up	279.83	0.29	296.83	0.29	<0.0005
	Down	273.50	0.87	292.67	0.29	<0.0005
Laser 200 μm	Up	269.33	0.29	289.17	0.29	<0.0005
	Down	264.33	0.58	286.17	0.29	<0.0005
Laser 273 μm	Up	245.83	0.29	256.83	0.29	<0.0005
	Down	240.33	0.29	250.17	0.29	<0.0005
Delta Wire Grasper (3.2F)	Up	176.33	0.29	188.83	0.29	<0.0005
	Down	170.83	0.29	186.00	0.50	<0.0005
1.7F Nitinol Stone Extractor	Up	272.67	0.29	295.17	0.29	<0.0005
	Down	268.00	0.00	290.33	0.29	n/a
2.2F Nitinol Stone Extractor	Up	252.33	0.29	272.50	0.50	<0.0005
	Down	245.17	0.29	268.00	0.50	<0.0005

SD=standard deviation.