The authors used data from a population-based case-control study of breast cancer in women aged<44 years (cases, n=975 ; controls, n=866) conducted between 1994 and 1996 in three counties of western Washington state to assess the validity and reliability of reported perinatal factors.
For a sample of participants, exposure information from self-administered questionnaires was validated with information from birth certificates (cases, n=378 ; controls, n=283).
Detailed information regarding perinatal characteristics of their daughters was also collected from subjects'mothers (case mothers, n=510 ; control mothers, n=436) to assess the reliability of subjects'reporting of these events.
Although reporting of birth weight by subjects (cases, r=0.83 ; controls, r=0.80) and their mothers (case mothers, r=0.89 ; control mothers, r=0.84) was highly correlated with the birth certificates, there was differential measurement error by subjects ; cases reported birth weight accurately on average, but controls tended to underestimate their birth weight.
Agreement between the subject and mother report was excellent for birth weight (cases, r=0.85 ; controls, r=0.87) and good for other perinatal factors, but birth order and maternal diethylstilbestrol use were underreported among cases and reported accurately among controls.
Differential measurement error of birth weight by case-control status resulted in biased odds ratios for breast cancer risk.
Mots-clés Pascal : Tumeur maligne, Glande mammaire, Poids naissance, Périnatal, Epidémiologie, Facteur risque, Validité, Homme, Femelle, Etats Unis, Amérique du Nord, Amérique, Glande mammaire pathologie
Mots-clés Pascal anglais : Malignant tumor, Mammary gland, Birth weight, Perinatal, Epidemiology, Risk factor, Validity, Human, Female, United States, North America, America, Mammary gland diseases
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0129482
Code Inist : 002B20E02. Création : 22/06/1998.