Fig. 1From: Quality of life, depression, and productivity of city government employees in Japan: a comparison study using the Athens insomnia scale and insomnia severity indexAthens Insomnia Scale (AIS) and Insomnia Severity Index (ISI) three-dimensional histogramThe height (z-axis) represents the number of subjects, with the ISI and AIS scores shown in the x- and y-axis, respectively.Back to article page