The 2012–2013 NESARC-III is a nationally representative face-to-face interview survey of 36 309 adults aged 18 years and older residing in households and selected group quarters,34,35 with respondents selected through multistage probability sampling. Primary sampling units were counties or groups of contiguous counties, secondary sampling units were groups of Census-defined blocks, and tertiary sampling units were house-holds within sampled secondary sampling units, within which eligible adult respondents were selected, with Hispanic, black, and Asian individuals oversampled. The household response rate was 72%; person-level response rate, 84%; and overall response rate, 60.1%, which were comparable with other current US national surveys.36,37 Data were adjusted for nonresponse and weighted to represent the US civilian population based on the 2012 American Community Survey.38 Weighting adjustments compensated for nonresponse. Comparing participants to the total eligible sample at the segment level, no significant differences were found in the percentage Hispanic, black, or Asian; population density; vacancy rate; and proportion in group quarters or renters. At the individual level, NESARC-III respondents did not differ from the total eligible sample on Hispanic ethnicity but differed slightly, albeit
