“…Another potential threat to the reliability of self-report is that male participants may tend to underreport psychiatric symptoms as compared with female participants, perhaps because open expression of fear is discouraged by the traditional masculine gender role. Indeed, studies of nonpatients indicate that female participants report more severe fears and phobias than do male participants on measures of self-reported fear (Agras, Sylvester, & Oliveau, 1969; Brown & Crawford, 1988; Cornelius & Averill, 1983; Farley, Sewell, & Mealiea, 1982; Geer, 1965; Kleinknecht & Lenz, 1989; Klorman, Weerts, Hastings, Melamed, & Lang, 1974) and are twice as likely as male participants to meet criteria for specific phobia (Fredrikson, Annas, Fischer, & Wik, 1996). Surveys such as these, however, cannot determine whether the obtained sex differences are due to reporting bias or whether they reflect actual differences in experienced fear.…”