MMSE

CDR

PSQI

Pearson correlation

P value

Spearman’s correlation

P value

Pearson correlation

P value

SE

0.049

0.837

0.170

0.473

−0.030

0.901

SL

−0.115

0.628

−0.049

0.839

0.193

0.415

SWS

0.135

0.570

0.328

0.158

−0.227

0.336

Arousal index

0.147

0.536

−0.183

0.440

0.120

0.613