Table 2.

Patient Groups and Attributes of Preoperative Opioid Exposure within One Year of Surgery

				Total oral morphine equivalent (OME)* filled during preop		Duration in month		Continuity in month		Recency in month
Group	Group name	n	%	median	iqr†	median	iqr	median	iqr	median	iqr
1	Minimal	50,495	29.95	250	400	1	0	1	0	8	4
2	Low	70,024	41.54	540	975	2	2	1	1	2	1
3	Moderate	30,108	17.86	4050	4640	7	2	4	2	2	1
4	High Chronic	17,952	10.65	11,964.4	15,460	11	1	11	2	1	1

^*5 OME = one 5mg hydrocodone tablet.

^†IQR = interquartile range