. Author manuscript; available in PMC: 2009 Nov 1.

Published in final edited form as: AJR Am J Roentgenol. 2008 Nov;191(5):1503–1508. doi: 10.2214/AJR.07.3591

Table 2.

Residual colonic fluid in CTC examinations from four institutions as assessed by automated QA software. Numbers are percent of colonic wall (±standard deviation) obscured by fluid. Institution 4 had significantly less residual fluid in both prone and supine positions compared to Institutions 1–3 (p < 0.01 and p < 0.001, respectively).

Institution	Number of Patients (n = 105)	Prone	Supine
1	28	14.9 ± 9.7^‡	17.8 ± 12.1^‡
2	26	19.0 ± 6.7	20.3 ± 9.5
3	23	21.6 ± 7.7	21.2 ± 8.0
4	28	9.1 ± 4.9	8.4 ± 3.7
Average	26.3	15.8 ± 8.7	16.6 ± 10.2

^‡

p < .05 by paired t-test