Table 6: Regression analysis with relative brachial nocturnal blood pressure decrease as dependent variable in hypertensive patients and healthy controls.

Patients B (95%CI) SE B β p
Constant 17.07 (1.05; 33.09) 8.03 0.04
eGFR, mL/min/1.73 m2 -0.01 (-0.17; 0.15) 0.08 -.01 0.93
Presence of OSA -1.48 (-5.66; 2.69) 2.09 -.10 0.48
Body mass index, kg/m2 -0.24 (-0.66; 0.19) 0.21 -.15 0.27
24h u-Na, mmol/24 hour 0.02 (-0.02; 0.06) 0.02 .14 0.28
R Square for this model: 0.05, p=0.51
Controls B (95%CI) SE B β p
Constant 18.19 (-6.64; 43.01) 12.36 0.15
eGFR, mL/min//1.73 m2 0.00 (-0.18; 0.18) 0.09 .00 0.99
Presence of OSA 2.43 (-1.99; 6.86) 2.20 .16 0.27
Body mass index, kg/m2 -0.14 (-1.08; 0.81) 0.47 -.05 0.77
24h u-Na, mmol/24 hour 0.01 (-0.05; 0.06) 0.03 .04 0.82
R Square for this model: 0.025, p=0.87

Abbreviation: eGFR: estimated Glomerular Filtration Rate, OSA: Obstructive Sleep Apnoea, 24h u-Na: 24h urinary sodium excretion. Statistics were performed using a linear regression model. Dependent variable was relative nocturnal brachial systolic BP decrease. Independent variables were eGFR, presence of OSA (AHI > 5), BMI, and 24h U-Na.