Table 3.

Comparison of opioid use patterns between preoperative non-chronic and chronic THA opioid users over each preoperative and postoperative time interval.

		% of cohort filling prescriptions			Average # of prescriptions filled			Morphine equivalent per day
		Non-chronic users	Chronic users	p-value	Non-chronic users	Chronic users	p-value	Non-chronic users	Chronic users	p-value
Preop	3 months- 6 weeks	8.9%	92.6%	<0.001	0.1	1.9	<0.001	1.2	70.3	<0.001
	6 weeks – DOS	4.5%	64.8%	<0.001	0.1	1.0	<0.001	1.5	54.8	<0.001
Postop	DOS - 6 weeks	95.0%	92.6%	0.481	1.5	2.4	0.020	34.1	82.3	<0.001
	6 weeks - 3 months	14.9%	55.6%	<0.001	0.2	1.3	<0.001	2.2	59.4	<0.001
	3 months - 4 ½ months	10.4%	63.0%	<0.001	0.1	1.6	<0.001	2.2	90.1	<0.001
	4 ½ months – 6 months	6.8%	51.9%	<0.001	0.1	1.2	<0.001	0.8	80.2	<0.001

DOS – Day of surgery.