Objective: To determine the completeness of data acquired previously o
n the attendance patterns of patients visiting three general practices
and the exclusivity of attendance at these practices. Design: A retro
spective comparison of attendance data with data extracted from the He
alth Insurance Commission database. Three study practices with investi
gated to give a rough cross-section of general practice in Western Aus
tralia. Results: Eighty-nine per cent of patients and 92% of services
recorded in our earlier study were also recorded by the HIC, with 31%
of patients also attending another general practice during the six mon
ths, mostly only once or twice. However, there was considerable variat
ion between practices in data match and attendance at other practices.
Conclusions: We found a high level of completeness of data. Sixty-nin
e per cent of patients attended no other practice during the six month
s, indicating that doctors in the study practices have some opportunit
y to provide continuity of care to their patients. The implications fo
r patients' needs and doctors' resources of variations in attendance p
atterns need to be examined further.