respondents if a symptom item had happened more than once in a follow-up question. However, in NESARC, duration criteria were directly embedded into the symptom questions (e.g., “more than once” drive a vehicle while drinking; see Table 1, Grant et al., 2004 for more details). Further, though NESARC items for past-12-month and prior-to-past-year were identical, in NLAES the duration criteria used for past-12-months (i.e., more than once in the follow-up question) was not included in prior-to-past-year. NLAES and NESARC also differentially used recurrence/duration questions to establish prior-to-past-12-month diagnosis for alcohol abuse. Specifically, NLAES required the endorsement of one of two recurrence/duration items for abuse diagnoses whereas NESARC did not (see Table 1).
