Table 1.

Prevalence of drug use among primary care community health center patients, by level of use and city

DRUG USEa	CITY
	Los Angeles (n=2226) %	Tijuana (n=2788) %
Any drug use
Lifetime	44.2***	15.1
Past 3 months	18.5***	3.6
Level of drug use
No or Low useb	80.6***	94.3
Moderate usec	16.0***	5.2
High used	3.4***	0.6
Moderate-to-High Use e	19.4***	5.7
Any injection drug use, lifetime	3.2*	1.8
Any injection drug use, past 3 months (%)	0.8*	0.3

^aDrug use = use of marijuana, cocaine/crack, methamphetamine and other amphetamines, inhalants, sedatives, hallucinogens, opioids

^bNo or Low Drug Use = ASSIST 0-3 for all drugs

^cModerate Drug Use = ASSIST 4-26 for at least one drug, no drug with ASSIST score >=27

^dHigh Drug Use = ASSIST >=27 for at least one drug

^eModerate-to-High Drug Use = ASSIST 4+ for at least one drug

^*P<0.05, Chi-square test for differences between cities

^**P<0.01, Chi-square test for differences between cities

^***P<0.001, Chi-square test for differences between cities