Cystatin C Levels in Middle-Aged Patients with Obstructive Sleep Apnea Syndrome

Table 4

Correlation analysis between serum cystatin C levels and anthropometric and sleep parameters in OSAS patients.

	Cystatin C
	BMI	−0.034	0.777
Age	0.064	0.585
Neck circumference	0.243	0.095
Waist circumference	0.248	0.089
Hip circumference	0.195	0.184
Waist to hip ratio	0.145	0.330
eGFR	−0.170	0.149
Creatinine	0.208	0.076
RDI	0.240	0.039
Aver. SpO2	−0.291	0.012
Min SpO2	−0.221	0.059
T < 90%	0.290	0.02

Aver. SpO₂: average oxyhaemoglobin saturation during sleep, BMI: body mass index, eGFR: estimated glomerular filtration rate, Min SpO₂: minimum oxyhaemoglobin saturation during sleep, OSAS: obstructive sleep apnea syndrome, RDI: respiratory disturbance index, and T < 90%: time with oxyhaemoglobin saturation <90% during sleep.