Secondary matching: a method for selecting controls in case-control studies on environmental risk factors.

Publisher: Oxford University Press Country of Publication: England NLM ID: 7802871 Publication Model: Print Cited Medium: Print ISSN: 0300-5771 (Print) Linking ISSN: 03005771 NLM ISO Abbreviation: Int J Epidemiol Subsets: MEDLINE

Original Publication: [London] Oxford University Press.

Case-Control Studies* ; Patient Selection*; Adult ; Aged ; Aged, 80 and over ; Humans ; Mesothelioma/epidemiology ; Middle Aged ; Multicenter Studies as Topic ; Pleural Neoplasms/epidemiology ; Random Allocation ; Reproducibility of Results ; Research Design ; Risk Factors ; Spain/epidemiology

Background: The problem of control selection was considered in a population-based case-control study on pleural mesothelioma in Spain. Random sampling from the population was discarded because of potential selection bias due to low participation. Selection of hospital controls by matching them to cases by hospital seemed unsuitable for investigating environmental exposures, as the choice of hospital may be related to the place of residence; controlling for residence may avoid bias but could produce overmatching.
Methods: A three-step procedure was proposed. First, a random sample of primary controls from the population census of the province of Barcelona was obtained. Second, the hospital closest to the residence of the primary control was identified as the control hospital. Third a secondary control was chosen among patients admitted to the hospital matched to the primary control by sex, age and municipality.
Results: An overall participation rate of 85% was achieved. The hospital control group showed a distribution of residences similar to that of the general population, and independent of the distribution of cases.
Conclusions: This procedure may be considered as an alternative for control selection when studying environmental factors or, generally, when matching cases and controls by hospital is to be avoided. Its validity was assessed according to the principles of comparability with cases regarding the study base, accuracy of information, deconfounding and efficiency.

Date Created: 20000208 Date Completed: 20000229 Latest Revision: 20190513

20231215

10.1093/ije/28.6.1130

10661658