Fig. 4

Responses to the 15 items of the Patient Health Questionnaire-8 and the Generalized Anxiety Disorder-7. Responses to the 15 items are presented using a normal scale (A), and a logarithmic scale (B). A As indicated by the arrow, the line graphs of the seven items appear to cross at a single point between “not at all” and “several days.” The lines decrease in synchrony from “several days” to “more than half the days,” before increasing in synchrony from “more than half the days” to “nearly every day.” B The lines show parallel fluctuation from “several days” to “nearly every day.”