Table 10 Linear regression for prediction of global sleep score.

Disease duration/years

0.067

3.788

 < 0.001*

PASI score

 − 0.037

 − 1.604

0.110

PSS

0.242

9.113

 < 0.001*

PDI

0.150

7.988

 < 0.001*

Prediction equation

Global score =  − 10.09 + 0.067 × disease duration + 0.242 × PSS + 0.150 × PDI

F = 89.59, p < 0.001*; Constant =  − 1.24; R² = 0.648