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Pittsburgh Sleep Quality Index

FN Fumihiko Nakamura
SK Shiko Kuribayashi
FT Fumio Tanaka
NK Noriyuki Kawami
YF Yasuhiro Fujiwara
KI Katsuhiko Iwakiri
MK Motoyasu Kusano
TU Toshio Uraoka
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Sleep disturbance was evaluated by the Pittsburgh Sleep Quality Index (PSQI) [12], which consists of 17 individual items grouped into the following seven components: subjective sleep quality, sleep latency, sleep duration, habitual sleep efficacy, sleep difficulty, hypnotic use, and daytime dysfunction. Each category receives a score of 0–3 (max total score 21). A higher total score indicates poorer sleep quality. The Japanese version of the PSQI has been validated and was used in the present study [11]. A total PSQI score of more than 5.5 was considered to indicate the presence of sleep disturbance [11].

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