Table 1. Demographic and clinical characteristics of patients with methicillin-resistant Staphylococcus aureus bloodstream infections, by IDU status, Tennessee, USA, 2015–2017*.

Characteristic	IDU status		p value	Overall
	IDU	Non-IDU
Total	1,839 (24.1)	5,807 (75.9)	<0.001	7,646 (100)
Onset year			<0.001
2015	375 (16.1)	1,958 (83.9)		2,333 (30.5)
2016	643 (25.0)	1,924 (75.0)		2,567 (33.6)
2017	821 (29.9)	1,925 (70.1)		2,746 (35.9)
Onset type			<0.001
CO-ED	1,156 (62.9)	3,202 (55.1)		4,358 (57.0)
CO-IP	572 (31.1)	1,911 (32.9)		2,483 (32.5)
HO	111 (6.0)	694 (12.0)		805 (10.5)
Age range, y			<0.001
13–17	1 (0.1)	24 (0.4)		25 (0.3)
18–34	617 (33.6)	387 (6.7)		1,004 (13.1)
35–49	665 (36.2)	912 (15.7)		1,577 (20.63)
50–64	436 (23.7)	1,789 (30.8)		2,225 (29.1)
>65	120 (6.5)	2,695 (46.4)		2,815 (36.8)
Median (range, Q1–Q3)	40 (31–51)	63 (51–74)	<0.001
Sex			<0.001
M	910 (49.5)	3,435 (59.2)		4,345 (56.8)
F	929 (50.5)	2,372 (40.8)		3,301 (43.2)
Race			<0.001
White	1,635 (88.9)	4,511 (77.7)		6,146 (80.4)
Black	168 (9.1)	1,193 (20.5)		1,361 (17.8)
Other	15 (0.8)	56 (1.0)		71 (0.9)
Unknown	21 (1.1)	47 (0.8)		68 (0.9)
Ethnicity			0.820
Hispanic	6 (0.3)	22 (0.4)		28 (0.4)
Non-Hispanic	1,768 (96.1)	5,563 (95.8)		7,331 (95.9)
Unknown	65 (3.5)	222 (3.8)		287 (3.8)
Insurance			<0.001
Commercial	109 (5.9)	648 (11.2)		757 (9.9)
Medicaid	570 (31.0)	655 (11.3)		1,225 (16.0)
Medicare	452 (24.6)	3,688 (63.5)		4,140 (54.2)
Self-pay/uninsured	612 (33.3)	476 (8.2)		1,088 (14.2)
Other/unknown	96 (5.2)	340 (5.9)		436 (5.7)

*Values are no. (%) except as indicated. CO, community onset; ED, emergency department; HO, hospital onset; IDU, injection drug use; IP, inpatient.