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. Author manuscript; available in PMC: 2020 Jan 1.
Published in final edited form as: Ann Surg Oncol. 2018 Sep 20;26(1):17–24. doi: 10.1245/s10434-018-6772-3

Figure 3: Impact of the intervention on quantity of opioid prescribed.

Figure 3:

Interrupted time series analysis was used to evaluate the impact of the intervention on the mean quantity of opioid prescribed each month. Error bars show 95% confidence intervals for each mean. [A] For simple mastectomy or wide local excision for melanoma, the mean quantity of opioid prescribed immediately decreased by 37% after the intervention, equivalent to 13 tablets of 5 mg oxycodone (P = 0.03). [B] For lumpectomy or breast biopsy, the mean quantity of opioid prescribed immediately decreased by 42% after the intervention, equivalent to 12 tablets of 5 mg oxycodone (P = 0.07).