Nov 17, 2020  |   2 minute read

Frequency – Alcohol | QFV-30days

Quantity–Frequency Variability (QFV – 30 days)

Recommended frequency: Every 4 weeks


The QFV 30 and the QFV 14 were developed from the Form 90, a structured interview to assess alcohol treatment outcomes. The QFV (Quantity-Frequency Variability) scales ask 3 questions, to assess the change in a person’s quantity and frequency of alcohol consumption over time.

The scales specifically track change in (i) how many days of drinking during the time period; (ii) average drinks on days when a person was drinking; and (iii) the number of ‘binge’ days (defined as 5 or more drinks).

Psychometric Properties

Studies have evaluated the reliability and validity of the Form 90. The test showed good-to-excellent reliability for all key summary measures of alcohol consumption and psychosocial functioning, and most frequently used illicit drugs had moderate reliability. No decay in consistency of self-reported drinking was found at more distal points from dates of test-retest interviews.


The Scale

All of these questions ask about your drinking  DURING THE PAST 30 DAYS. For each question, please indicate the correct number in the space provided.

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For Question 2 and 3, any of the following counts as  ONE DRINK:

One glass (10 ounces) of beer

One glass (4 ounces) of wine

One ounce of liquor or other distilled spirits

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This assessment asks about three important factors related to alcohol consumption: (1) drinking days, (2) average drinks, and (3) number of days consuming 5 or more drinks. The QFV is intended to track changes in these factors over time.

Copyright Information

Tonigan, J. S., Miller, W. R., & Brown, J. M. (1997). The reliability of Form 90: An instrument for assessing alcohol treatment outcome. Journal of Studies on Alcohol, 58(4), 358-364.