TABLE 1.

Percentage of Admissions Age 50 to 54 Years Old, 55 Years and Older, and All Ages by Primary Substance Abused From 1992 to 2005^a

Primary Substance (%)	1992	1993	1994	1995	1996	1997	1998	1999	2000	2001	2002	2003	2004	2005
Alcohol
50–54 years old	84.2	81.5	77.3	76.2	75.3	72.7	70.2	67.9	64.7	63.0	61.0	59.2	58.2	57.2
55 years old and older	89.4	87.9	85.3	84.3	83.9	82.7	81.9	79.7	77.9	76.0	74.5	72.7	70.9	69.0
All ages	61.0	58.5	54.4	52.4	52.0	50.7	49.8	49.1	47.4	45.5	44.3	42.8	41.4	40.4
Heroin
50 to 54 years old	9.1	10.9	13.1	13.8	13.7	15.7	16.4	17.8	19.6	20.0	20.3	20.2	19.3	18.7b
55 years old and older	5.9	7.2	8.8	9.3	9.0	10.0	9.9	10.9	11.7	12.2	12.9	13.4	13.7	14.1
All ages	11.2	12.4	13.3	13.9	14.0	15.0	14.9	15.3	15.7	15.9	15.5	15.0	14.5	14.2c
Cocaine
50–54 years old	4.0	4.6	5.9	5.8	6.6	6.9	7.7	7.6	8.5	9.0	9.9	11.3	12.3	13.2
55 years old and older	2.0	2.3	2.8	3.1	3.4	3.6	4.2	4.4	4.9	5.4	6.1	6.8	7.6	8.5
All ages	17.9	17.9	18.3	17.0	16.5	15.1	15.3	14.4	13.9	13.3	13.3	14.0	14.2	14.3
Prescription opioids
50–54 years old	0.7	0.7	0.8	1.0	1.0	1.2	1.4	1.7	1.9	2.1	2.6	2.7	3.2	3.2
55 years old and older	0.7	0.7	0.9	1.1	1.2	1.2	1.2	1.3	1.4	1.8	1.9	2.3	2.6	2.8
All ages	0.8	0.8	0.9	0.9	1.0	1.0	1.1	1.3	1.6	2.1	2.4	2.8	3.3	3.6
Marijuana
50–54 years old	0.8	0.9	1.3	1.4	1.7	1.7	1.9	2.2	2.3	2.3	2.5	2.6	2.8	3.0
55 years old and older	0.5	0.6	0.7	0.8	0.9	0.9	1.0	1.2	1.2	1.4	1.6	1.8	2.0	2.0
All ages	6.1	7.1	8.8	10.5	12.0	12.6	13.2	13.8	14.6	15.4	15.7	16.0	16.4	16.3
Methamphetamine
50–54 years old	0.1	0.2	0.3	0.4	0.5	0.6	0.8	0.9	0.9	1.3	1.6	1.8	2.1	2.6
55 years old and older	0.1	0.1	0.1	0.2	0.2	0.2	0.3	0.4	0.5	0.6	0.9	1.0	1.1	1.4
All ages	1.0	1.3	2.1	2.9	2.6	3.4	3.4	3.5	3.9	4.7	5.7	6.4	7.1	8.5

^aPrescription opioids exclude methadone. Greater than 99.6% of all age category is 12 years and older. Bolded values indicate significant (p < 0.0001) increase or decrease from 1992 within each age group.

^bSignificant decrease compared to 2002.

^cSignificant decrease compared to 2001.