Table 2.

Associations between average blood serotonin levels and breathing parameters.

Parameter	r Spearman	p-Value
AHI	− 0.155	0.114
ODI	− 0.215	0.027
OA	− 0.210	0.032
CA	− 0.197	0.044
HI	− 0.155	0.114
Average saturation	0.079	0.424
Minimal saturation	0.162	0.099
Average desaturation decline	− 0.160	0.109

Apnea–hypopnea index (AHI), oxygen desaturation index (ODI), obstructive apnea (OA), central apnea (CA), hypopnea index (HI).