. Author manuscript; available in PMC: 2012 Jan 1.

Published in final edited form as: J Clin Child Adolesc Psychol. 2011 Jan;40(1):136–143. doi: 10.1080/15374416.2011.533411

Table 2.

Lifetime Prevalence of Substance Use by PTSD Status in the NSA and NSA-R

	NSA (1995)^a Lifetime PTSD				NSA-R (2005)^b Lifetime PTSD

	Yes		No		Yes		No

	%	95% CI	%	95% CI	%	95% CI	%	95% CI
Cigarette Use	65.6	[60.4, 70.8]	40.8	[39.2, 42.4]	53.6	[47.4, 59.8]	23.1	[21.7, 24.5]
Non-experimental Cigarette Use	29.7	[24.7, 34.7]	11.1	[10.1, 12.2]	19.4	[14.5, 24.4]	5.5	[4.7, 6.2]
Alcohol Use	72.5	[67.6, 77.3]	53.9	[52.3, 55.6]	59.9	[53.8, 66.0]	29.1	[27.5, 30.6]
Marijuana Use	35.3	[30.1, 40.5]	13.6	[12.4, 14.7]	34.1	[28.2, 40.0]	13.6	[12.4, 14.8]
Non-experimental Marijuana Use	25.7	[20.9, 30.5]	8.4	[7.5, 9.3]	24.6	[19.3, 29.9]	8.3	[7.3, 9.2]
Hard Drug Use^c	27.9	[22.9, 32.8]	7.8	[6.9, 8.6]	29.4	[23.7, 35.0]	6.8	[5.9, 7.6]
Non-experimental Hard Drug Use^c	17.7	[13.5, 21.8]	2.9	[2.3, 3.4]	14.7	[10.3, 19.1]	2.7	[2.1, 3.2]

Note. PTSD = Posttraumatic Stress Disorder; NSA = National Survey of Adolescents; NSA-R = National Survey of Adolescents-Replication; CI = confidence interval

N = 3,906.

N = 3,423.

Variable represents use of any of the following drugs: cocaine, heroin or methadone, LSD or other hallucinogens (i.e., peyote or psilocybin), or inhalants (i.e., glue nitrous oxide, amyl nitrate, paint, or gasoline).