American Journal of Epidemiology Vol. 131, No. 1: 79-90
Copyright © 1990 by The Johns Hopkins University School of Hygiene and Public Health
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RELIABILITY OF PERSONAL INTERVIEW DATA IN A HOSPITAL-BASED CASE-CONTROL STUDY
Slone Epidemiology Unit, School of Public Health, Boston University School of Medicine Brookline, MA
Reprint requests to Judith P. Kelly, Stone Epidemiology Unit, School of Public Health, Boston University School of Medicine, 1371 Beacon Street, Brookhne, MA 02146
Responses to interview questions were compared for concordance among 492 individuals interviewed more than once in a hospital-based case-control surveil lance system in the United States, Canada, and Israel between 1976 and 1982. Reliability of the data was determined using the Kappa statistic and the intraclass correlation coefficient Reliability was good to excellent for demographic factors, such as birthplace, and for medical conditions/procedures that require hospitalization or continuing medical care, such as hysterectomy. Reliability was fair to good for less serious or less well-defined medical conditions/procedures, such as cystic breast disease, and for current habits, such as daily coffee consumption. Regarding medication use, reliability was poor to fair for drugs taken intermittently, such as aspirin and penicillin, and good to excellent for drugs taken on a regular basis, such as oral contraceptives. As expected, medications were reported more consistently when duration of use was prolonged. The data were also analyzed according to two intervals between interviews (<1 year and
1 year). For most factors, reliability was not materially affected by interval. Where differences were observed, reliability tended to be better when the second interview followed the first by less than 1 year. These results suggest that structured interviews administered to hospital patients by trained personnel can elicit reliable data on demographic and medical history factors.
epidemiologic methods; interviews
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