Table 2.

Individual Time Interval Means for the First and Second TLFB Assessment

	First assessment			Second assessment
Item	0–30 days prior	31–60 days prior	61–90 days prior	0–30 days prior	31–60 days prior	61–90 days prior
Maximum drinks	9.1	9.4	8.3	8.4	8.8	8.5
Total drinks	59.4	58.0	59.8	59.0	55.1	59.8
Drinking days	6.3	6.2	6.1	6.4	6.1	6.6
Heavy drinking days	5.9	5.3	5.4	4.8	4.2	4.8
Marijuana use days	9.7	10.5	9.7	10.2	11.1	10.1
Composite drug use daysa	9.5	8.7	9.6	8.4	9.1	10.4
Drug or alcohol use days	11.1	11.1	11.2	10.9	10.9	11.6

Note. Means based on participants who reported use of the substance of interest during indicated time period on test or retest. Time intervals are based on the number of days prior to the date of the first assessment. TLFB = Timeline Follow Back.

^aComposite drugs use variable that sums all drug use data except alcohol and marijuana