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. 2023 Oct 16;13:17541. doi: 10.1038/s41598-023-44757-5

Table 7.

Relation between psoriasis disability index and sleep quality in studied cases.

PSQI components Psoriasis disability index Test of significance
Subjective sleep quality
 0 3 (0–26)

KW = 61.88

p < 0.001*

 1 8 (1–26)
 2 19 (4–21)
Sleep latency
 0 3 (0–26)

KW = 53.90

p < 0.001*

 1 8 (0–26)
 2 12 (1–26)
 3 10 (0–21)
Sleep duration
 0 4 (0–26)

KW = 22.51

p < 0.001*

 1 7.5 (0–26)
 2 21.5 (20–23)
 3 23 (23–23)
Sleep efficiency
 0 4 (0–26)

KW = 26.02

p < 0.001*

 1 10 (0–26)
 2 7 (4–15)
 3 26 (26–26)
Sleep disturbance
 0 4 (0–26)

KW = 23.29

p < 0.001*

 1 19.5 (0–26)
 2 20 (17–21)
Day time dysfunction
 0 4 (0–26)

KW = 38.74

p < 0.001*

 1 19 (0–26)
 2 16.5 (12–21)
Global score
 Good sleep ≤ 5 4 (0–26) Z = 7.44, p < 0.001*
 Poor sleep > 5 20.5 (4–26)

KW Kruskal Wallis test, Z Mann Whitney U test, PSQI Pittsburgh sleep quality index.

*Statistically significant.