TABLE 5

Univariate correlation of % blood pressure dip, nocturnal systolic blood pressure and non-dipping status with biomarkers of potential contributory pathways

% Blood pressure dipNocturnal systolic blood pressureNon-dipping status
VariableCorrelation coefficientp-valueCorrelation coefficientp-valueUnstandardised β (95% CI)Standardised βp value
Urinary norepinephrine−0.2420.0870.3870.0071.006 (1.000–1.013)0.0060.058
Angiotensin II0.0780.539−0.0820.5330.045 (0.00–1688.09)−3.0960.564
Renin0.0770.5450.0520.6911.000 (0.999–1.000)0.0000.398
RHI−0.1000.482−0.0040.9811.277 (0.425–3.544)0.2040.706
Endothelin 10.0990.4380.0250.8490.775 (0.584–1.027)−0.2550.076
CRP−0.2130.0920.1560.2351.044 (0.898–1.214)0.0430.577
IL-60.0220.8640.0640.6261.115 (0.906–1.374)0.1090.304
TNF-α0.1470.248−0.0580.6611.003 (0.939–1.072)0.0030.923

RHI: reactive hyperaemia index; CRP: C-reactive protein; IL-6: interleukin-6; TNF-α: tumour necrosis factor-α.