Table 3.

Correlation between Warrick score, carbon monoxide diffusion test and polysomnographic parameters.

	AHI events/hours	ODI events/hours	MinSat%	Average Sat%	SPO2 <90%
Warrick score (r; P)	0.28; 0.014	0.264; 0.019	−0.225; 0.046	−0.11; 0.33	0.235; 0.038
Carbon monoxide diffusion test (r; P)	0.04; 0.75	0.01; 0.97	0.474; 0.001	0.364; 0.001	−0.686; 0.001

AHI – apnea-hypopnea index; ODI – oxygen desaturation index; Min sat – minimum saturation; SPO₂ <90 – total sleep time during which oxygen saturation was lower than 90%.