Table I presents the abbreviations and definitions of illness on which we based our samples for analysis. We chose three increasingly restrictive definitions of AN based on the literature and previous linkage analysis results [Devlin et al., 2002; Grice et al., 2002]. For all definitions, participants were required to meet all DSM-IV criteria for AN except Criterion D, amenorrhea. The first analysis was conducted on the sample defined by the broadest definition of illness (All AN; N = 1,085). This sample included 415 individuals with RAN, 266 with PAN, 132 with BAN, 266 with ANBN, and 6 with subthreshold AN with no binging or purging. The second analysis was based on a sample defined as AN with No Binge Eating (N = 687) and included only individuals with AN subtypes that did not include regular binge eating. This definition of illness was chosen due to the fact that the presence of binge eating has been identified as a distinguishing feature within the AN diagnostic category [Herzog et al., 1996]. This sample comprised 415 individuals with RAN, 266 with PAN, and
