Table 5.

Factors associated with log C-reactive protein level

Independent variable	Beta coefficient	SE	t-values	P	Model unadjusted R2; adjusted R2; P
Age	0.251	0.004	1.485	0.147	0.471; 0.238; 0.044
BMI	0.497	0.005	2.925	0.006
Neck circumference	−0.197	0.010	−1.162	0.253
Systolic blood pressure	0.144	0.002	0.998	0.326
Average duration of hypopnea	0.091	0.007	0.603	0.551
Minimum SpO2	0.062	0.004	0.432	0.668
Average SpO2	0.445	0.042	1.680	0.102
AHI	−0.882	0.131	−0.880	0.385
Sqrt sum of all desaturations	0.274	0.057	0.765	0.449
Sqrt total arousal index	−0.131	0.076	−0.346	0.731
Sqrt SpO2 time below 90%	0.324	0.049	1.371	0.179
Sqrt respiratory arousal index	−0.587	0.126	−0.760	0.452
Sqrt number of hypopneas during NREM	−0.374	0.018	−1.622	0.114
Sqrt AHI during REM	0.197	0.023	0.873	0.389
Sqrt AHI during NREM	1.641	0.143	1.445	0.158
Intercept	−6.870*	4.212	−1.631	0.112

*Unstandardized beta coefficient for intercept; for all other independent variables, standardized beta coefficients are shown. BMI=Body mass index, AHI=Apnea-hypopnea index, REM=Rapid eye movement sleep, NREM=Non-REM, SpO₂=Oxygen saturation, SE=Standard error, Sqrt= Square root