Table 4.

Relation between psoriasis duration and sleep quality in studied cases.

PSQI components	Disease duration/years Median (min–max)	Test of significance
Subjective sleep quality
0	6 (1–30)	KW = 12.6 p = 0.002*
1	10 (3–30)
2	9.5 (2–12)
Sleep latency
0	6 (1–30)	KW = 16.79 p = 0.001*
1	7 (1–20)
2	9 (3–30)
3	11 (1–20)
Sleep duration
0	7 (1–20)	KW = 10.0 p = 0.019*
1	9 (1–30)
2	11.5 (7–16)
3	17 (17–17)
Sleep efficiency
0	7 (1–30)	KW = 8.61 p = 0.035*
1	9 (1–20)
2	12 (2–18)
3	3 (3–3)
Sleep disturbance
0	7 (1–20)	KW = 6.88 p = 0.032*
1	8 (1–30)
2	9 (4–10)
Day time dysfunction
0	7 (1–30)	KW = 6.49 p = 0.039*
1	10 (1–17)
2	9 (9–9)
Global score
Good sleep ≤ 5	6.5 (1–30)	Z = 3.41 p = 0.001*
Poor sleep > 5	10 (2–18)

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

*Statistically significant.