“…One question is how we explain the observed differences in ethnic group disparities found across studies. For instance, depending on the study, the ethnic group with the highest prevalence of DUIA varies from White or non-White Hispanic (Caetano and McGrath, 2005;Caetano and Clark, 2000;Johnson et al, 1998;Liu et al, 1997;Walker et al, 2003), to Hispanic (Ferguson et al, 2002;Voas et al, 1998;Watt, 2004), to Native American (Cheung et al, 1999;Chou et al, 2005Chou et al, , 2006, with varying or limited explanations offered for these inconsistencies. This point has been acknowledged by Caetano and McGrath (2005) in their study of drinking and driving among ethnic groups in the United States.…”