NHANES. For the NAS, because of a survey design change eliminating oversampling of the least populated states, the estimates for Native American/Alaskan Natives for the most recent NAS are much lower than estimates for previous years. Therefore, this group is omitted from NAS trend analyses. Education was coded as less than high school, high school only, or more than high school (e.g., college degree, some college, or other postsecondary education). We did not examine all sociodemographic categories studied by Grant and colleagues (Grant et al., 2017) because of difficulties in harmonizing categories across surveys and across years within some surveys.
