TABLE 3.

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

	% Blood pressure dip		Non-dipping status
Variable	Correlation coefficient	p-value	Unstandardised β (95% CI)	Standardised β	p-value
Age	−0.067	0.594	0.989 (0.923–1.060)	−0.11	0.759
BMI	−0.248	0.022	1.096 (0.987–1.218)	0.092	0.086
Neck circumference	−0.373	0.004	1.147 (0.952–1.383)	0.138	0.149
Waist–hip ratio	−0.168	0.258	1.223 (0.00–50 465.75)	0.202	0.970
Smoking pack-years	−0.238	0.061	0.975 (0.928–1.025)	−0.025	0.318
HbA1c	−0.192	0.125	1.139 (0.963–1.349)	0.131	0.129
HOMA	−0.227	0.087	1.170 (0.909–1.507)	0.157	0.223
Creatinine	−0.007	0.955	1.00 (0.959–1.043)	0.000	0.990
eGFR	0.047	0.710	1.001 (0.961–1.044)	0.001	0.951
Cholesterol	−0.019	0.881	1.238 (0.655–2.339)	0.213	0.511
Triglycerides	−0.183	0.144	1.831 (0.841–3.948)	0.605	0.127
HDL	0.151	0.229	0.423 (0.080–2.229)	−0.862	0.310
LDL	0.007	0.955	1.157 (0.560–2.390)	0.145	0.694
AHI	−0.327	0.002	1.037 (1.000–1.075)	0.036	0.049
ODI	−0.371	0.002	1.042 (1.001–1.085)	0.041	0.044
TST90	−0.251	0.044	1.126 (0.966–1.311)	0.118	0.128
Minimal O2 saturation	0.282	0.023	0.921 (0.850–0.998)	−0.082	0.045
Arousal index	−0.116	0.363	1.005 (0.961–1.052)	0.005	0.822

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%.