Measuring various drug use dimensions with a calendar method.
This note presents a technique used to acquire a variety of time-specific data on drug use. The calendar technique involves self-reported patterns of consumption and any changes therein, including cessation. Advantages of this technique over other approaches are discussed, and examples of the variety of use measures that can be derived from the calendar method are  illustrated.
D006801:Humans; D019966:Substance-Related Disorders; D013997:Time Factors