“…However, reliability between study centers was still highly variable (r=0.37 to 0.95) (Wing and Nixon, 1975). Determining the prevalence of FRAH in schizophrenia has also been problematic, with estimates ranging from 10–40% for RC, 0–34% for VC, and 22–48% for cases with at least one FRAH (Ahmed and Naeem, 1984; Bland and Orn, 1980; Carpenter and Strauss, 1974; Chandrasena and Rodrigo, 1979; Gureje and Bamgboye, 1987; Lewine et al, 1982; Malik et al, 1990; Marneros, 1984; Mellor, 1970; Peralta and Cuesta, 1999; Salleh, 1992; Shinn et al, 2011; Thorup et al, 2007; Zarrouk, 1978). The variations in FRAH estimates may reflect different clinical and cultural contexts (Chandrasena, 1987), but also may be due to the variable use of narrow or wide interpretations of FRAH (Koehler, 1979; O’Grady, 1990), as well as the use of different diagnostic criteria for schizophrenia when determining FRAH base rates (Nordgaard et al, 2008).…”