19 20 Briefly, patients were identified using multiple sources of notification by specially trained study nurses and fieldworkers.
Other sources of notification were from professional associations (88%) and professional association journals, website or email discussion lists (86%), CPE (69%) and informal discussion with colleagues (60%).
However, in Victoria, physicians and laboratories were required to report these infections, making it unlikely that both sources of notification would incorrectly report the residential address.
A simple form of capture-recapture, stratifying for factors that may affect the probability of notification (Hook and Regal, 1995), is appropriate for the National Registry of Childhood Tumours (NRCT), as there are two principal sources of notification.
The major sources of notification to the WARDA are hospitals and private practitioners, WA Department of Health databases (midwives', mortality, and hospital morbidity systems), and investigative and treatment centres (cytogenetic, pathology, and genetics services).
Moreover, HES data are clearly not independent of other hospital-based sources of notification; in particular, the cross-check could not detect any unregistered children who were treated by non-NHS clinicians, or were diagnosed only around the time of death.
The Victorian Birth Defects Register has multiple sources of notification: It collects information on all births from the PDCU where there has been a reported birth defect and includes data on pregnancy terminations for birth defects before and after 20 weeks.
So far, discussion has centred around the partitioning, at source, of notifications into: a) a directly and indirectly identifiable segment; and b) a potentially re-identifiable segment, and the strict maintenance of this separation subsequently.
The source of notification for quarantine influenced understanding of the reason for quarantine.
