American Journal of Epidemiology Vol. 132, No. 3: 572-575
Copyright © 1990 by The Johns Hopkins University School of Hygiene and Public Health
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DO MOTHERS OVERESTIMATE BREAST FEEDING DURATION? AN EXAMPLE OF RECALL BIAS FROM A STUDY IN SOUTHERN BRAZIL
1Departamento de Medicina Social, Universidade Federal de Pelotas Pelotas, RS, Brazil
2Evaluation and Planning Centre (S. R. A. H., J. P. V.) and Maternal and Child Epidemiology Unit (S. R. A. H.), London School of Hygiene and Tropical Medicine London, United Kingdom
The problem of recall bias when reporting breast feeding duration is investigated. Data are presented from the follow-up of over 1,000 children from a birth cohort (1982) in southern Brazil, when they were on average 11, 23, and 47 months of age. Compared with the response given at 11 months of age, 24% of mothers misclassified the duration (grouped into 3-month categories) at age 23 months and 30% at age 47 months. Women who were richer and/or better educated were significantly more likely to report longer durations, while those poorer and less educated did not tend to misclassify more in one direction than in the other.
breast feeding; epidemiologic methods; memory
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