Data
182,066 items of data are available, covering 182,066 participants, encoded using Data-Coding
2557.
Notes
Sleep online question: "During the past month, how much of a problem has it been for you to keep up enough enthusiasm to get things done?"
The question in this field was taken from the Pittsburgh Sleep Quality Index.
Buysse D J, Reynolds CF, Monk TH, Berman SR, Kupfer DJ. The Pittsburgh Sleep Quality Index: A new instrument for psychiatric practice and research. Psychiatry Research 1989 May;28(2):193-213.