摘要：The Australian Childhood Immunisation Register (ACIR) commenced operation in January 1996and provides a comprehensive database of children's immunisations in Australia. The ACIRenables implementation of an immunisation recall and reminder system and improvedsurveillance and reporting of immunisation coverage. Before the introduction of the ACIR, themethods used in assessing coverage varied widely in design and quality, with few studiesmeasuring coverage at national or statewide level. This is a systematic review of the scope andreliability of estimates of immunisation coverage available in Australia from 1990 to 1998. A totalof 108 studies were identified of which 51 were classified as higher quality based on a range ofcriteria including whether they had a response rate of 50% or better
