“…Several studies have concentrated on the medical outpatient population (Roberts & Morton, 1952;Culpan, Davies & Oppenheimer, 1960;Sainsbury, 1960;Mannucci, Friedman & Kaufman, 1961;Stoeckle, Zola & Davidson, 1962;Davies, 1964;Maclay, 1965) while others have demonstrated a similar problem in surgical outpatients (Zwerling et al, 1955;Culpan et al, 1960), in gynaecological clinics (Bryson, 1945;Morris & O'Neill, 1958;Culpan et al, 1960), and in a casualty department (Mestitz, 1957) while Priest (1962) covered this particular problem in the course of a large (1000 cases) survey of outpatients in general. The incidence found in this study (29-4 %), is very close to the average (27-3 %) in eleven different surveys of medical outpatients reviewed by Davies (1964).…”