aneur: Aortic aneurysm progression data
Description
This dataset contains a list of transitions between
grades of aortic aneurysms, measured by ultrasound examination of the
diameter of the aorta.format
A data frame containing 2662 rows. Columns correspond to
'starting state', 'end state', 'time interval', 'age at beginning of
interval'. The stages represent successive degrees of aneurysm
severity. rll{
Stage 1 Aneurysm-free < 30 cm
Stage 2 Mild aneurysm 30-44 cm
Stage 3 Moderate aneurysm 45-54 cm
Stage 4 Severe aneurysm > 55 cm
}
These were obtained from 4337 ultrasound scans from 838 men over 65.
683 of these men were aneurysm-free at age 65 and were re-screened every two
years. The remaining men were aneurysmal at entry and had successive
screens with frequency depending on the stage of the aneurysm.
Stage 4 aneurysms are repaired by surgery.
source
The Chichester, U.K. randomised controlled trial of screening for
abdominal aortic aneurysms by ultrasonography.References
Couto, E. and Duffy, S. W. and Ashton, H. A. and Walker, N. M.
and Myles, J. P. and Scott, R. A. P. and Thompson, S. G. (2002)
Probabilities of progression of aortic aneurysms: estimates
and implications for screening policy
Journal of Medical Screening 9(1):40--42