Table 3.

Percent distribution on opioid days-supply and average opioid dose per surgical encounter with opioid^a, October 2008-September 2017

	Non-extract encounters			Encounters with extractions			All surgical encounters
	26 & older	Under 26	All	26 & older	Under 26	All	All ages
Sample n	81,224	25,737	106,961	80,099	85,658	165,757	272,718
Total days-supply	Percent distribution
1 day	5.6	7.2	6.0	3.8	3.2	3.7	4.7
2	26.5	28.2	26.9	22.6	21.7	22.1	24.0
3	29.3	26.3	28.6	32.1	30.5	31.3	30.2
4	11.1	10.4	10.7	11.9	13.5	12.7	12.0
5	10.0	8.6	9.9	11.6	11.5	11.6	10.7
6–10 days	5.1	4.8	5.0	5.0	5.0	4.5	4.9
11–20	3.2	3.0	3.1	2.7	2.6	2.6	2.8
21 or more	8.3	9.6	8.6	7.5	8.2	7.9	8.2
Total MME	Average morphine milligram equivalents
Mean (SD)b	109 (76)	104 (74)	108 (76)	126 (69)	134 (59)	131 (64)	121 (70)
Median	90	90	90	113	150	120	105
IQR (low, high)	75, 150	60, 120	67, 150	80, 150	90, 150	90 150	75, 150
Total MME > 100, % yes	40.5	36.0	36.2	54.6	61.2	58.0	50.7

^aAnalysis based on opioid prescriptions that were written on date of surgical encounter or either pre-surgery (within 30 days prior), or post-surgery (within 30 days after surgery). If multiple prescriptions were on the same date or within this 60 day window, days-supply and total MME were summed for all prescriptions.

^bT-test of difference in means 26 and older relative to under age 26 for non-extraction procedures, unequal variances = 9.3 p < 0.0001; T-test for extraction procedures, unequal variances = −26.3, p<0.001

IQR = interquartile range; the values reported are for the 25th percentile and 75^th percentile

MME = morphine milligram equivalents