Using daily reports to measure drinking and drinking patterns

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Abstract

Daily measurements of drinking are used to measure alcohol consumption, validate retrospective questionnaires, and examine associations between drinking and other behaviors. The advantages of using daily reports include reducing retrospective biases and forgetting of drinking occasions; disadvantages include increased costs and potential for reactivity. Methodological issues to consider in using daily reports include reporting method (written, telephone, electronic), reporting interval, data collection period, respondent attrition, and missing data. Compared to retrospective reports, daily reports result in more reported drinking occasions but similar average quantity consumed, and correlations between retrospective and daily measures are generally high. The utility of daily reports depends on the research question and the purpose of the measurements.

Section snippets

Strengths and limitations of daily reporting methods

As a data collection technique, using daily reports has both advantages and disadvantages when compared to retrospective questionnaires Roghmann & Haggerty, 1972, Stone et al., 1991, Tennen et al., 1991, Verbrugge, 1980. Daily reporting generally results in higher levels of reported behavior, especially of relatively commonplace behaviors that are easily forgotten Roghmann & Haggerty, 1972, Verbrugge, 1980, and these higher levels are often assumed to be more accurate (Verbrugge, 1980). Because

Data collection methods

Daily reports of events or behaviors can be made in three ways (Wheeler & Reis, 1991). In interval-contingent recording, participants report on their experience at regular predetermined intervals (for example, every day). The reports usually cover what happened during the previous interval. Signal-contingent recording requires that participants make a report when they are signaled by the investigator (via a pager or other electronic device). These signals can be sent at random or fixed

Reporting interval

The choice of the reporting interval depends on the length of time that is theoretically important and the period that participants can report accurately (Stone et al., 1991). For convenience, many studies use a day as the reporting interval, with participants reporting at the end of the day about events that occurred throughout that day. For transient phenomena such as moods, multiple assessments each day are more appropriate; alternatively, participants could report once a day and note the

Validity issues

Because daily reports are assumed to be more accurate than alternative measures Armstrong et al., 1992, Verbrugge, 1980, they are often used to validate other measures, primarily retrospective questionnaires. However, because daily reports are not perfectly valid, comparisons of daily reports to other measures do not assess validity but rather intermethod reliability, a “measure of the ability of two different instruments that measure the same underlying exposure to yield similar results on the

Results of studies that compare daily reports to retrospective questionnaires

Nearly 30 published studies have compared daily reports with retrospective measures of alcohol use (see listing in Appendix A). Retrospective measures used in these comparisons include:

  • 7-day recall, in which participants recall their drinking on each day of the previous week Corti et al., 1990, Gerstel et al., 1980a, Gerstel et al., 1980b, Lemmens et al., 1988, Lemmens et al., 1992, Samo et al., 1989, Whitty & Jones, 1992.

  • A quantity–frequency (QF) or quantity–frequency–variability (QFV)

Summary and conclusions

Given the costs of daily data collection, the demands on participants, and the possibility of reactivity, we may ask whether collection of this type of data is worthwhile. The answer depends on the purpose for which the reports are used. For simply measuring drinking frequency, quantity, or volume, daily reports may not be necessary: Retrospective estimates usually capture levels of drinking fairly well, although less well for heavy or very infrequent drinkers. Validity of retrospective

Acknowledgements

Preparation of this paper was supported by grants no. AA09701 and no. K02 AA0183 from the National Institute on Alcohol Abuse and Alcoholism.

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