I n t e r v e n t i o n Men were allocated to be invited (n = 33 839) or not to be invited (n = 33 961) for screening. The invited group received by mail an invitation from their family physician, an information booklet, and a questionnaire. Those accepting the invitation attended a clinic and had an ultrasonographic scan of the abdominal aorta. Scan results were sent to the family physicians. ...