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OBJECTIVE: To examine different sick-leave measures used in sickness absence research, and to suggest a systematic way of assessing sickness absence. METHODS: A review and analysis of five major studies on sick-leave performed 1983-1988 with an epidemiological approach. RESULTS: Terminology and measures used varied in the different studies reviewed. The choice of a certain measure was seldom discussed in relation to the aim of the study. Based on the review five measures are suggested: frequency, length, incidence rate, cumulative incidence and duration. The definition of incidence rate is new and is a measure useful in studies of recurrent events within epidemiology. CONCLUSIONS: We have reviewed sick-leave measures previously used in the literature and suggested five basic measures for assessing sick-leave.
Hensing et al. (Wed,) studied this question.