Center for Research in Neuropsychology and Cognitive Behavioral Intervention

CHARACTERIZATION: A self or hetero-response instrument designed to assess sleep quality specifically in old age. STRUCTURE AND SCORING: The PSQI comprises a first section with 7 items assessing sleep latency, difficulty in falling asleep, number of night awakenings, waking up spontaneously too early, subjective perception that waking up too early constitutes a problem for the person and two items that evaluate general subjective sleep quality and sleep depth. In this first section the answers range from 0 to 4, and their sum provides the Subjective Sleep Quality Index that can range from 0 (better sleep) to 28 (worse sleep). The second section, concerning sleep correlates, is composed of 12 dichotomous questions (Yes/No) (e.g., daytime sleepiness; physical activity). A Insomnia Index, based on DSM-5 criteria, results from having answered “yes” to questions 1.1 to 1.4 and “no” to questions 1.6, 2.1 to 2.6, 7.1 to 7.5, 9 and 10.1 to 10.4. PSYCHOMETRIC CHARACTERISTICS: The internal consistency was good (Cronbach’s α= 0.81). A principal components analysis and the scree plot inspection revealed a meaningful one-factor solution, explaining 48.8% of the total variance.