“…Most periodontal epidemiological studies using the Russell PI among African populations were carried out during the 1950s, 1960s and 1970s. The populations for which Russell PI data exist comprise study groups in West Africa (Ghana and Nigeria) (8), East Africa (Tanzania, Kenya and Uganda) (8), Ethiopia (119, 162, 180, 181), Sudan (57, 171, 182), Nigeria (56, 58, 59, 61, 191–193, 195), Cameroon (34), Uganda (114, 198), Morocco (169), and Tanzania (142).…”