International Journal of Epidemiology, Vol 18, S50-S53, Copyright © 1989 by International Epidemiological Association
CA Ngelangel
Hospital visitor-companions are being used as a source of controls in an
ongoing case-control study on breast cancer in the Philippines. As a tool
for rapid epidemiologic assessment in obtaining research data for
case-control studies, visitor-companions may serve as an alternative source
of controls. To determine their generalizability and consistency, this
proposed group was compared to neighbourhood controls and to
hospital-patient controls. Hospital visitor-companions were comparable to
neighbourhood controls in terms of cooperation in the interviews, height,
weight, marital status, longest residence, education, cigarette smoking,
alcohol intake, annual income, proportion with salaried jobs, ownership of
house, land, and business, number of people living in the house, number of
siblings, medical history, parity, menopausal status, breast feeding
practices, and use of oral contraceptives. Neighbourhood controls however
had longer interview durations than visitor-companion controls (p less than
0.05). Hospital- patient controls were less likely to breast feed, had
lower alcohol intake, and had more exposure to chronic diseases and
diagnostic x-ray than visitor-companion or neighbourhood controls (p less
than 0.05). It was concluded that visitor-companions may usefully serve as
an alternative source of controls for case-control studies when their
limitations are taken into consideration during analysis.
ARTICLES
Hospital visitor-companions as a source of controls for case-control studies in the Philippines
Clinical Epidemiology Unit, University of the Philippines, Philippine General Hospital, Manila.
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