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Fig. 2 Mean segmental distention scores on prone positioning with
patient-controlled room air (RA) and automated carbon dioxide
(CO2). Lower scores represent greater distention. Mean segmental
distention showed no clear preference between CO2 and RA on prone,
with no statistically significant differences. Rectum on prone had best mean
segmental distention score among all segments (supine or prone) for both RA
and CO2.