Quantity–Frequency Variability (QFV – 14 days)
Recommended frequency: Every 2 weeks
Summary
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 of the QFV-14
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.