TABLE 3

Univariate correlation of % blood pressure dip and non-dipping status with patient parameters

% Blood pressure dipNon-dipping status
VariableCorrelation coefficientp-valueUnstandardised β (95% CI)Standardised βp-value
Age−0.0670.5940.989 (0.923–1.060)−0.110.759
BMI−0.2480.0221.096 (0.987–1.218)0.0920.086
Neck circumference−0.3730.0041.147 (0.952–1.383)0.1380.149
Waist–hip ratio−0.1680.2581.223 (0.00–50 465.75)0.2020.970
Smoking pack-years−0.2380.0610.975 (0.928–1.025)−0.0250.318
HbA1c−0.1920.1251.139 (0.963–1.349)0.1310.129
HOMA−0.2270.0871.170 (0.909–1.507)0.1570.223
Creatinine−0.0070.9551.00 (0.959–1.043)0.0000.990
eGFR0.0470.7101.001 (0.961–1.044)0.0010.951
Cholesterol−0.0190.8811.238 (0.655–2.339)0.2130.511
Triglycerides−0.1830.1441.831 (0.841–3.948)0.6050.127
HDL0.1510.2290.423 (0.080–2.229)−0.8620.310
LDL0.0070.9551.157 (0.560–2.390)0.1450.694
AHI−0.3270.0021.037 (1.000–1.075)0.0360.049
ODI−0.3710.0021.042 (1.001–1.085)0.0410.044
TST90−0.2510.0441.126 (0.966–1.311)0.1180.128
Minimal O2 saturation0.2820.0230.921 (0.850–0.998)−0.0820.045
Arousal index−0.1160.3631.005 (0.961–1.052)0.0050.822

BMI: body mass index; HbA1c: glycosylated haemoglobin (mmol·mol−1); HOMA: homeostasis model assessment; eGRF: estimated glomerular filtration rate; HDL: high-density lipoprotein; LDL: low-density lipoprotein; AHI: apnoea–hypopnoea index; ODI: oxygen desaturation index; TST90: total sleep time with O2 saturations <90%.