Sleep variables
The two groups significantly differed in sleep quality (PSQI:
t112=3.16, p=0.002, Cohen’s d=0.59) and insomnia
severity (ISI: t112=2.83, p=0.006, Cohen’s d=0.53;
Figure 1). The AD group reported poorer sleep quality (PSQI: mean ± std.
dev., 7.58 ± 3.90) and more severe insomnia symptoms (ISI: 8.39 ± 5.81)
than the healthy subjects (PSQI: 5.42 ± 3.37; ISI: 5.51 ± 5.04).