Fig. 2From: Correlates of self-report chronic insomnia disorders with 1–6 month and 6-month durations in home-dwelling urban older adults - the Shih-Pai Sleep Study in Taiwan: a cross-sectional community studyThe distribution of DSM-IV insomnia disorder with different duration quantifiers in various medical conditions. (Chronic diseases were defined as pharmacologically-treated morbidities.)Back to article page