“…A previous study of observer variability in recording pulses in the foot gave results from which the authors concluded that there was "very great observer error with respect to the detection of ankle pulses", and that "the inability to detect an ankle pulse by one observer is quite without significance" (Ludbrook, Clarke, and McKenzie, 1962). These are disturbing suggestions for the clinician and the epidemiologist, particularly in view of the considerable attention currently being paid to the detection of early peripheral arteriosclerosis (Widmer, Greensher, and Kannel, 1964;Cooper, Hill, and Edwards, 1967;Lancet, 1967).…”