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How much is enough? Assessing 30- versus 60-day Timeline Followback stability in youth alcohol use patterns.

Anna E Kirkland1, Pamela L Ferguson2, Tirza J Alcala1

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|October 27, 2025
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Summary

A 30-day Timeline Followback (TLFB) window is sufficient for assessing youth alcohol use patterns. This shorter reporting period captures comparable data to longer windows, reducing participant and staff burden.

Keywords:
Timeline Followbackalcoholresearch methodssubstance useyouth

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Area of Science:

  • Adolescent health
  • Substance use research
  • Psychological assessment

Background:

  • Youth alcohol use patterns exhibit variability, often necessitating extended reporting periods in studies.
  • Longer Timeline Followback (TLFB) windows, while comprehensive, increase participant and research staff burden.
  • This study investigated the efficacy of shorter TLFB windows for youth alcohol use assessment.

Purpose of the Study:

  • To evaluate the adequacy of a 30-day TLFB window for capturing youth alcohol consumption patterns.
  • To compare alcohol use data from two consecutive 30-day periods (Days 1-30 and Days 31-60).
  • To inform the design of future research protocols for adolescent alcohol use studies.

Main Methods:

  • Utilized a modified TLFB to assess alcohol consumption over 60 days in 481 participants (ages 15-25).
  • Collected data on total drinks, drinking days, and binge drinking days, divided into two 30-day intervals.
  • Employed Spearman correlations, Wilcoxon signed rank tests, and intraclass correlations (ICC) for analysis across subgroups.

Main Results:

  • All measured alcohol outcomes were significantly correlated between the two 30-day reporting windows (p < 0.001).
  • Alcohol use was generally higher in the more recent 30-day period (Days 1-30), with small, clinically similar differences.
  • Intraclass correlation coefficients indicated moderate-to-good reliability between the reporting windows.

Conclusions:

  • A 30-day TLFB reporting window is adequate for assessing youth alcohol use.
  • This shorter window provides comparable and agreeable self-reported alcohol use data.
  • Utilizing a 30-day TLFB window effectively reduces participant and study burden.