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Table 3 Pittsburgh Sleep Quality Index: scores and components’ descriptive analyses

From: Sleep disturbances in obsessive-compulsive disorder: influence of depression symptoms and trait anxiety

PSQI component Score 0 Score 1 Score 2 Score 3 Statistic ͣ df P value
OCD HC OCD HC OCD HC OCD HC
N
(%)
N
(%)
N
(%)
N
(%)
N
(%)
N
(%)
N
(%)
N
(%)
Subjective sleep quality 14 (23%) 35 (35%) 24 (39.3%) 54 (54%) 16 (26.2%) 8 (8%) 7 (11.5%) 3 (3%) X2 = 11.98 3 0.001*
Sleep latency 16 (26.2%) 36 (36%) 15 (24.6%) 42 (42%) 11 (18%) 19 (19%) 19 (31.1%) 3 (3%) X2 = 15.38 3 < 0.001*
Sleep duration 36 (59%) 66 (66%) 15 (24.6%) 25 (25%) 6 (9.8%) 7 (7%) 4 (6.6%) 2 (2%) X2 = 2.12 3 0.145
Habitual sleep efficiency 32 (52.5%) 61 (61%) 13 (21.3%) 25 (25%) 8 (13.1%) 7 (7%) 8 (13.1%) 7 (7%) X2 = 2.85 3 0.091
Sleep disturbance 1 (1.6%) 6 (6%) 31 (50.8%) 78 (78%) 25 (41%) 16 (16%) 4 (6.6%) 0 (0%) X2 = 20.60 3 < 0.001*
Use of sleeping medication 35 (57.4%) 86 (86%) 4 (6.6%) 8 (8%) 2 (3.3%) 2 (2%) 20 (32.8%) 4 (4%) X2 = 24.23 3 < 0.001*
Daytime dysfunction 11 (18%) 51 (51%) 20 (32.8%) 41 (41%) 17 (27.9%) 7 (7%) 13 (21.3%) 1 (1%) X2 = 38.25 3 < 0.001*
  1. Abbreviations: OCD Obsessive-Compulsive Disorder, HC Healthy Controls, PSQI Pittsburgh Sleep Quality Index
  2. ͣ X2 for a linear trend. *P < 0.05