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. Author manuscript; available in PMC: 2014 Oct 30.
Published in final edited form as: Adv Surg. 2013;47:299–328. doi: 10.1016/j.yasu.2013.03.003

Fig. 3.

Fig. 3

Frequency of imaging use, NA, and perforation in SCOAP hospitals, 2006–2011. Use of imaging, NA, and perforation are expressed as annual percentages. The Cochran-Armitage test was used to evaluate for trends over time.