Fig. 4From: Quality of life, depression, and productivity of city government employees in Japan: a comparison study using the Athens insomnia scale and insomnia severity indexReceiver operating characteristic (ROC) analysis of the Athens Insomnia Scale (AIS) item scores for the comparison of short sleep duration and sleepiness. AIS_4, fourth AIS item: total sleep duration; AIS_6, sixth AIS item: problems with sense of well-being; AIS_8, eighth AIS item: sleepiness during the dayBack to article page