Table 3.

Flowers task: multilevel model of marijuana high in relation to reaction time.

Effects			Flowers reaction time (n=58)
			Estimate	SE	95% CI	P value
Fixed effects
	Person level (level 2)
		Intercept	592.88	128.62	N/Aa	.001b
		Session	−0.14	0.08	N/A	.08
		Session2 (quadratic)	N/A	N/A	N/A	N/A
		Subjective high (PMc)	57.45	30.16	N/A	.06
		Distraction (PM)	−81.80	89.75	N/A	.36
		Subjective high (PM) × distraction (PM)	−20.74	20.79	N/A	.32
		Gender (0=male, 1=female)	−9.64	10.59	N/A	.36
		Age (0=age 20)	6.49	3.17	N/A	.04d
		Full-scale IQ (0=IQ score of 110)	2.50	1.04	N/A	.02d
	Session level (level 1)
		Subjective high (CCe)	2.29	0.86	N/A	.008b
		Distraction (CC)	−4.38	2.88	N/A	.13
		Subjective high (CC) × distraction (CC)	−0.39	0.55	N/A	.48
Random effects
	Level 1 residual variance		3415.85	99.90	3225.55 to 3617.38	N/A
	Intercept		1259.15	274.92	820.79 to 1931.64	N/A
	Distraction		56.58	28.40	21.15 to 151.33	N/A
	Covariance (distraction, intercept)		0.48	71.70	−140.04 to 141.00	N/A

^aNot applicable.

^bP<.01.

^cPM: person mean scores, reflecting individual differences in subjective marijuana high or distraction across all sessions.

^dP<.05.

^eCC: constant-centered scores (centered at 0), reflecting session-to-session variation in scores or session-specific scores.