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. Author manuscript; available in PMC: 2015 Nov 13.
Published in final edited form as: J Am Coll Surg. 2013 Nov 23;218(1):16–25.e1-4. doi: 10.1016/j.jamcollsurg.2013.09.008

Figure 1.

Figure 1

Variability in adherence to select quality of care indicators over time across medical oncology practices. The magnitude of the change in adherence from 2006 (hatched bars) to 2009 (black bars) varied significantly across medical oncology practice sites for (A) perineural invasion (site by time interaction, p < 0.001), (B) examination of ≥12 lymph nodes (site by time interaction, p ≤ 0.001), (C) informed consent (site by time interaction, p = 0.04), and (D) documentation of planned chemotherapy regimen (site by time interaction, p < 0.001); however, (E) treatment with approved chemotherapy regimens improved consistently across sites (site by time interaction, p = 0.80).