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© 1994 Oxford University Press

other

Daily Morbidity Records: Recall and Reliability

P BYASS*,{dagger} and P W HANLON*

* Medical Research Council Laboratories PO Box 273, Banjul, The Gambia

{dagger} Current address: Nottingham School of Public Health, Queen's Medical Centre, Nuttingham NG7 2UH, UK

Methodological issues concerning the collection and analysis of daily morbidity data in community studies in developing countries are discussed. The effects of recall period and inter-observer variation on symptom prevalence are considered in the context of a longitudinal study in The Gambia, in which prevalence fell by about half over 1-week's recall. In the ssme study, many infant-days were recorded separately on two occasions, allowing an assessment of reliability in this type of morbidity diary data. The implications of these findings both in term of data quality and cost-effectiveness are discussed, with the conclusion that weekly interviews examining the previous week's morbidity on a day-by-day basis are operationally optimal.

Received 1 January 1994


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