Subscore based on 9 items from Pittsburgh Sleep Quality Index, with a range of 0-3. A score of "0" indicates no difficulty, while a score of "3" indicates severe difficulty.
Buysse et. al 1989 (PubMed ID: 2748771)External semantic reference:
CDE Search for all PSQI variables within this dataset Source: :psqi_5b:, :psqi_5c:, :psqi_5d:, :psqi_5e:, :psqi_5f:, :psqi_5g:, :psqi_5h:, :psqi_5i:, :psqi_5j: