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K6 item responses on logarithmic scales. (a) NHIS 2016 sample, and (b) NHIS 2017 sample on logarithmic scales. The gradients of the linear patterns of the K6 item responses are gentle between “a little” and “some” (red arrows), steep between “some” and “most” (blue arrows), and gentle again between “most” and “all of the time” (green arrows).
