Table 1. Prevalence of Opioid-Related Hospitalizations Among Adults Aged 18 or Older, National Inpatient Sample, 2011–2015^a .

Characteristic	Yearb
	2011 (n = 639,586)	2012 (n = 655,520)	2013 (n = 664,480)	2014 (n = 704,670)	2015 (n = 574,880)
Age, y
18–34	29.35	30.30	30.37	29.98	29.22
35–54	39.51	38.23	37.07	36.29	35.97
55–64	15.86	16.50	17.06	17.60	18.37
≥65	15.29	14.97	15.50	16.12	16.44
Sex
Male	49.73	49.34	49.02	49.15	49.63
Female	50.27	50.66	50.98	50.85	50.37
Race/ethnicity
White	70.76	71.26	72.67	73.16	72.99
Black	16.30	15.36	14.22	14.12	14.44
Hispanic	8.33	8.70	8.79	8.30	8.38
Asian	0.69	0.78	0.75	0.84	0.88
Native American	0.65	0.70	0.65	0.74	0.77
Other	3.27	3.20	2.84	2.84	2.59
No. of comorbidities
None	0.69	0.57	0.54	0.39	0.40
One	5.39	5.41	4.97	4.49	4.23
Two or more	93.91	94.02	94.48	95.12	95.37
Rural/urban status
Rural	35.59	40.81	42.04	41.57	41.71
Urban	64.41	59.19	57.96	58.43	58.29
Payer
Medicaid	30.74	31.61	31.29	37.66	39.30
Medicare	30.20	30.62	31.56	31.85	31.53
Private	21.22	21.06	20.72	19.62	19.61
Self-pay	13.35	12.19	12.02	7.80	6.45
Other	4.49	4.52	4.41	3.08	3.11

^a Data are percentages, per 100,000 hospitalizations; sampling weight adjusted in all statistics.

^b Values for n indicate the total number of opioid-related hospitalizations for the year.