Fig 2. Coefficients of determination (R²) in stepwise multiple regression models for CT_LFA in all males and males stratified according to VO₁₀₀.

(A) All males, (B) males with VO₁₀₀, and (C) males without VO₁₀₀. Variables entered into the stepwise regression analyses were selected from age, BMI, neck circumference, waist circumference, systolic and diastolic blood pressures, alcohol intake, use of lipid-lowering agents, current smoking, VFA, SFA, AHI, 4%ODI, %T<90, lowest SpO₂, arousal index, REM sleep, AHI during REM, supine sleep time, AHI in supine position, Epworth sleepiness scale score, CRP, triglycerides (TG), HDL-cholesterol (HDL-C), LDL-cholesterol, fasting plasma glucose (FPG), and HOMA-IR when yielding a P-value <0.10 by univariate analysis.