. Author manuscript; available in PMC: 2010 Nov 15.

Published in final edited form as: Am J Cardiol. 2009 Sep 26;104(10):1343–1350. doi: 10.1016/j.amjcard.2009.07.003

Table 7.

Anterior Air Noise, Descending Aorta Noise, and Tube Current. SD denotes standard deviation, CI denotes confidence interval, HU denotes Hounsfield units.

		Mean	SD	95% CI	P Value
Anterior Air Noise (HU)	Sequential-if-appropriate Strategy vs.	16.8	3.7	16.3 – 17.3	0.0019
	Helical-only Strategy	15.5	4.5	14.7 – 16.2	0.0019

	Sequential Protocol vs.	17.1	3.8	16.6 – 17.6	<0.0001
	Helical Protocol	15.4	4.3	14.8 – 16.0	<0.0001

	Helical Protocol in Sequential-if-appropriate Strategy vs.	15.1	3.2	14.0 – 16.2	0.62
	Helical Protocol in Helical-only Strategy	15.5	4.5	14.7 – 16.2	0.62

Descending Aorta Noise (HU)	Sequential-if-appropriate Strategy vs.	36.7	8.5	35.7 – 37.8	<0.0001
	Helical-only Strategy	32.1	8.2	30.7 – 33.4	<0.0001

	Sequential Protocol vs.	37.4	8.4	36.3 – 38.5	<0.0001
	Helical-only Protocol	32.2	8.1	30.9 – 33.4	<0.0001

	Helical Protocol in Sequential-if-appropriate Strategy vs.	32.5	7.9	29.8 – 35.1	0.79
	Helical Protocol in Helical-only Strategy	32.1	8.2	30.7 – 33.4	0.79

Tube Current (mA)	Sequential-if-appropriate Strategy vs.	445.3	122.3	430.4 – 460.2	0.0044
	Helical-only Strategy	477.4	67.7	466.0 – 488.8	0.0044

	Sequential Protocol vs.	433.7	116.3	418.4 – 449.0	<0.0001
	Helical Protocol	485.7	87.1	472.7 – 498.8	<0.0001

	Helical Protocol in Sequential-if-appropriate Strategy vs.	517.8	135.2	472.0 – 563.5	0.013
	Helical Protocol in Helical-only Strategy	477.4	67.7	466.0 – 488.8	0.013