Figure 2.

Analysis as in figure 1 but with inclusion of four studies considered to be “possibly suitable for inclusion.” ACAPS=asymptomatic carotid artery progression study; Clofibrate Co-op=clofibrate cooperative study; CAIUS=carotid atherosclerosis Italian ultrasound study; SENDCAP=St Mary's, Ealing, Northwick Park diabetes cardiovascular disease prevention study (for full names of other studies see figure 1)