Table 2.

Correlations among demand indices assessed via daily Alcohol Purchase Task (APT) measure, brief APT at baseline, and full APT at baseline in a sample of 95 underage male and female college student drinkers

	1	2	3	4	5	6	7	8	9

1. Daily intensity (mean)	1
2. Daily O_max (mean)	.27^**	1
3. Daily breakpoint (mean)	.12	.83^**	1
4. Brief baseline intensity	.77^**	.13	.05	1
5. Brief baseline O_max	.16	.40^**	.34^**	.05	1
6. Brief baseline breakpoint	−.10	.28^**	.43^**	−.10	.53^**	1
7. Full baseline intensity	.76^**	.18	.11	.87^**	.26^*	−.03	1
8. Full baseline O_max	.25^*	.48^**	.46^**	.29^**	.61^**	.45^**	.33^**	1
9. Full baseline breakpoint	−.08	.28^**	.37^**	−.09	.34^**	.36^**	−.09	.50^**	1
10. Daily drinks (mean)	.46^**	.21^*	.21^*	.42^**	.24^*	.10	39^**	.21^*	.02	1
11. Daily neg cons (mean)	.15	.08	−.01	.16	−.02	.02	.09	−.02	−.23^*	.16	1
12. Daily pos cons (mean)	.13	.15	−.01	.09	−.04	−.06	.04	−.03	−.26^*	.08	.55^**	1

Note:

^**

p<.01

p<.05

Bolded correlations are parallel variables across different versions of the APT; Intensity = consumption at zero cost , O_max = peak expenditure for alcohol, Breakpoint = cost at which consumption is suppressed to zero; “Daily” (mean) measures represent person averages calculated across 28 days of assessment; overall there were 2625 (out of 2660 possible) daily assessment points