Cost-effectiveness of current practice with 2-yearly screening and of potential 3-yearly screening strategies in Australia. The positions on the cost-effectiveness plane of the main screening strategies for the evaluation are indicated with solid symbols. These strategies had equivalent compliance in underscreened women (equivalent levels of re-attendance after 4 years from the last screening test were assumed). Open symbols indicate position on the cost-effectiveness plane if screening compliance was exactly as observed in NZ and the UK, even at periods greater than 4 years. Strategies marked E1 and E2 involve alternate assumptions about early re-screening - E1 indicates that early re-screening levels at 12 months are equivalent to those currently observed in Australia, whereas E2 indicates that this level of rescreening is observed over 24 months (dotted arrows indicate decreasing levels of early re-screening).