TABLE 3.

Correlations Between the Positive and Negative Components of MEEQ-B and Marijuana Use and Motivation to Change Use at Baseline

Marijuana Variable	MEEQ-Bp	MEEQ-Bn
Average number of joints per weeka	0.085	-0.208†
Average number of joints on smoking daysb	0.035	-0.190**
Number of days smoked in last 3 monthsa	0.243*	-0.246*
Average number of joints smoked per daya	0.085	-0.208**
Motivation to Change Marijuana Usec	-0.154**	0.416††

Note. MEEQ-B_p = Marijuana Effect Expectancy Questionnaire—Adolescent Brief, positive scale; MEEQ-B_n = Marijuana Effect Expectancy Questionnaire—Adolescent Brief, negative scale.

^aN = 125 because this variable calculated only if adolescent had access to marijuana for > 45 days out of 90.

^bN = 117 because this variable calculated only if adolescent smoked in the 3 months before incarceration and only if adolescent had access to marijuana for >45 days out of 90.

^cN = 130.

^*p < .005.

^**p < .05.

^†p < .01.

^††p < .001.