Table 5.

The correlations between PAPP-A levels and clinical parameters.

Parameters	r ∗	p
Body mass index	0.126	0.241
Minimum O2 level in night	0.309	0.042
Mean O2 level in night	0.407	0.006
NREM1 (%)	0.136	0.377
NREM2 (%)	−0.143	0.356
NREM3 (%)	0.149	0.333
REM (%)	0.159	0.302
Epworth score	0.058	0.710
AHI score	−0.460	0.002
C-reactive protein	−0.002	0.988
Erythrocyte sedimentation rate	−0.088	0.415

^∗Spearman correlation analysis.