The type A-type B typology has been replicated in several studies using different samples and somewhat different measures (Litt et al. 1992; Brown et al. 1994; Schuckit et al. 1995). In addition, researchers consistently have found that males and females differ in their distribution among the two subtypes: Males are more prominent within the type B category (e.g., Brown et al. 1994; Schuckit et al. 1995).
