title: Do mothers overestimate breast feeding duration? An example of recall bias from a study in southern Brazil.
abstract: 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.
authors.affiliation: Departamento de Medicina Social, Universidade Federal de Pelotas, RS, Brazil.
authors.forename: S R
authors.initials: SR
authors.lastname: Huttly
authors.forename: F C
authors.initials: FC
authors.lastname: Barros
authors.forename: C G
authors.initials: CG
authors.lastname: Victora
authors.forename: J U
authors.initials: JU
authors.lastname: Beria
authors.forename: J P
authors.initials: JP
authors.lastname: Vaughan
mesh_terms: D001938:Brazil; D001942:Breast Feeding; D004522:Educational Status; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D007182:Income; D008568:Memory; D011939:Mental Recall; D013997:Time Factors