. Author manuscript; available in PMC: 2019 Jul 1.

Published in final edited form as: Salud Publica Mex. 2018 Jul-Aug;60(4):451–461. doi: 10.21149/8603

Table III. Adjusted pairwise contrasts of past-year drug use and DUD symptoms by city, within countries. U.S.-Mexico Study on Alcohol and Related Conditions (UMSARC), 2011-2013.

	United States									Mexico

	Laredo vs. San Antonio (ref)			Brownsville/McAllen vs. San Antonio (ref)			Laredo vs. Brownsville / McAllen (ref)			Nuevo Laredo vs Monterrey (ref)			Reynosa / Matamoros vs Monterrey (ref)			Nuevo Laredo vs. Reynosa / Matamoros (ref)

	aOR	95% CI^e	p	aOR	95% CI^e	p	aOR	95% CI^e	p	aOR	95% CI^e	p	aOR	95% CI^e	p	aOR	95% CI^e	p

Drug outcome
Any illicit drug use^a	1.12	[0.80, 1.55]		0.88	[0.51, 1.52]		1.27	[0.70, 2.30]		3.75	[1.97, 7.14]	^***	1.66	[0.81, 3.40]		2.26	[1.17, 4.38]	^*
Any prescription drug use^b	3.03	[2.16, 4.24]	^***	0.94	[0.57, 1.56]		3.20	[2.01, 5.11]	^***	3.03	[1.39, 6.60]	^**	2.66	[1.10, 6.42]	^*	1.14	[0.55, 2.36]
Any drug use	2.21	[1.64, 2.97]	^***	0.84	[0.55, 1.29]		2.64	[1.72, 4.04]	^***	3.36	[1.98, 5.68]	^***	2.15	[1.15, 4.02]	^*	1.56	[0.93, 2.63]
Polydrug use^c	3.36	[2.42, 4.66]	^***	1.33	[0.68, 2.61]		2.52	[1.23, 5.18]	^*	1.88	[0.72, 4.91]		1.93	[0.65, 5.73]		0.97	[0.40, 2.39]
DUD symptoms^d	1.70	[1.17, 2.47]	^**	0.83	[0.49, 1.41]		2.05	[1.22, 3.43]	^**	6.14	[1.92, 19.67]	^**	2.57	[0.65, 10.22]		2.39	[0.96, 5.92]

Note. ref = Reference; aOR = Adjusted Odds Ratio; CI = Confidence Interval; DUD = Drug Use Disorder. Each row is a logistic model (for each country) with drug use or problem as dependent variable and city as independent, adjusted by sex, age (continuous), education (4 categories), employment (4 cat), religion (3 cat), marital status (3 cat), native of survey city and being in neighbor country in the past year.

Illicit drugs are 1) marijuana, 2) cocaine/crack, 3) heroin/opium, 4) methamphetamines, 5) hallucinogens and 6) other recreational drugs.

Use of prescription drugs that were not prescribed for the respondent or that was not taken as prescribed. Prescription drugs are 1) pain relievers, 2) sedatives, 3) stimulants and 4) other prescription drugs.

Polydrug use is defined as using two or more of any of the drugs listed as illicit or prescription.

DUD symptoms assessed were hazardous use and quit/control.

Adjusted for the survey design.

p < .05.

^**

p < .01.

^***

p < .001.